i always like these topics, lots of different opinions, but lots of sense being posted in here
i co-ordinate the Vintage Festival held in Sydney, Australia each year
Fortunately for our event we've been able to keep it more on the fun side, most of our classes run the 540 johnson motor, the 2wd and 4wd stock buggy classes use this motor too and they are usually the most popular classes. it levels the playing field and saves transmissions for sure.
We also have open buggy classes too where you can run as much motor as you want. we split our buggies into 2 age groups, 1991 and older and 1996 and older, we also split out the non racing oriented buggies and have separate classes for hotshots and another for the classic 2wds like frogs and wild ones
hop ups need to be period unless its for reliability purposes and doesnt also present an advantage, eg, slippers are ok, 3mm belt setup is ok if you were replacing a 2mm belt setup thats hard to get belts for etc, agreed with Dan regarding the Optima mid example, as soon as lazer parts are added, it gets classified as a lazer
As we run on old school dirt/clay, we allow 2.2" rims. An interesting fact, we also run a 2wd purist class where the old 6 gear rc10s race original ultimas like it was the 87 worlds again, and they have to run on old / original tyres. The foxes/wild ones on modern rubber were lapping quicker than the rc10s which suprised me
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