HHMM,
Well, what I believe would shared, is the following:
Optimum oil clearances, piston to wall clearances, perfect bores, state of the art rings, gapped precicesly, low tension oil ring. Perfect valve job with tedious blending of seat angles. Fully blueprinted, and destined to go as fast as possible, for short periods of time.
That's it.
An NHRA / IHRA Stocker obviously can't use any of the port modifications, aftermarket intakes or carbs, aftermarket cranks / altered strok, ect.
Mine must retain stock stroke, stock compression ratio, stock lift flat tappet cam, stock ports, stock intake, stock carbs. Yeah, there's a "few" tricks within there, but with the exception of the noted above, virtually none of the high tech, trick modifications can be used.