I think the best part of coming back into the racing scene now days is the advent of more modern electrics. Setting up an old chassis with modern electrics is a must if you want to prove the chassis is capabable of competing with modern cars. It seems in Japan they are running anything pre 90's as we are here in Australia. If you run any later years people just wont show up with some of the cooler old stuff and that really defeats the purpose. I have thought in the past that they should cater to 2 different time zones. Pre 90's and pre 94'. This would allow for both era's of vehicle to be competitive in its own right.
As for what electrics to run,I dont think it needs to be a battle of power supply or ESC technology but rather the car itself. I think if most people took out their 'as run' pre 90's cars and put them on the track with their original electrics you'll find many of them feeling disheartened when they just refuse to make the end of the race.
There's no doubt that some of the electrics from way back when just dont stack up when it comes to reliability. Im sure someone out there may prove me wrong but for the majority most wont have old gear that will do the job.
As for what year or vintage car to run,I dont think it needs to be the most competitive but rather the old cars that hold some sentimental value. Sometimes I like to run cars I know just keep up with the top gun's of the day but thats what makes it fun.
I started out with the Optima back in the mid 80's and after all these years I finaly got another one together and raced it this past weekend amongst some of the modern cars. The car didnt miss a beat and went brillantly all day long.