...when you first get in it and look down the track , and your date is screwed up tighter than a hose clamp ...this will all seem like small beer. Compared to all other types of motorsport this is practically "run whatcha brung"...but there are reasonable limits, mostly based on safety.
No-one here is trying to "can" you , quite the opposite, they want you to succeed, but that means staying within the rules....and they've been refined over nearly sixty years.
My vote says 750 bike motor, four wheels .....fan-bleedin'-tastic!