Hi Anjan,
The question posed by pertains more towards originality, condition and permissible alteration to vehicles which are being judged at some show or the other. The problem is that there are a lot of opinions, opinions differ and often change. In some events a points/rating system is in place, but it is for the judges to decide on the quantum of points to give. I may deduct 5 points on your Landmaster just because you have put sunshades. These shades are a modern non period accessory and prevent the upholstry ( hopefully rexine so that your shirt will stick to it after some time) from being baked in the sun.
Another judge will say that this is a cool accessory. Seriously, apart from that joke, your car should have the sunshade over the front screen.
Ideally, a car should be 100% original to get 100% points. But if you now apply two categories, original and restoration, you automatically have a different outlook and perspective to judge from. Today Pebble Beach has these as two distinctively separate categories, but remember that at one time there was no such distinction. So in a way, down the line, an opinion, or now consensus changed. Are you still with me?
A car which is say 100% original, cannot be 100% pristine as mechanicals, upholstry, paint etc. do age. So now you replace. If the material is available, good, if not, then the nearest. So if you use Standox paints in place of Duco on a car, you should lose points. If you chrome plate instead of nickel finish, again points can be lost. And now you come to the real question, what changes are permissible?
That depends, if you use the car or nuture the car to win prizes. These two are distinctive different situations. In todays time when we are used to more comforts, you must fit an electric fuel pump. Today who want to put a wet cloth on the fuel pump? You can definitely fit radials. You can definitely convert to 12 volts, though from my own experience 6 volts works if you use the car regularly. I drove a 6 volt car in my first 5 years of driving. All alterations can be justified, the answer is to keep them to a minimum and reversible to be able to revert to original when an event occurs. Since you are talking of a Landmaster for a concors event, most of the modifications done to your car are a no no. A Landmaster will always face difficulty in such an event.
I drive an Amby. I have alternator, electric fuel pump, AC, music system, Sachs Shox, enlarged rear glass (front glass also fitted behind), extra security lock in door(today who in his right mind would steal it?) etc. And when I use that car to transport me to a rally, never as an entry, it still get some admiring crowd because it is shiny bright green and complete, not rusty like some of the "modern" classic cars entered with incomplete headlights just to artificially increase the numbers.
Another fact to remember is that not all judges are competent, and I also learnt at the Cartier event that one has to sell his car to the judges, so convince him that your alterations are legitimate.
But keep in mind, alteration made to make the car more user friendly, and alterations made to have the car mobile for concors shows are two different subjects. For a concors show, alternator and fuel pump are not allowed. About the electrics, why bother. A judge may ask you to start your car, but has he ever asked you to switch on the light? Very rarely he would do that, and anyhow how will he see that you use 12 volts in place of 6 volts and which bulb is fitted?
This post is also with jest, because in many cases judging at our events is a joke! And I can back that up!
Cheers harit