Re: Radiator
According to NHRA Rulebook, Stock classes:
"Full size radiator mandatory for body used. Aluminum radiators permitted; must retain stock dimensions and appearance. Cutting, denting or elimination of any body, fender, radiator or grille panels prohibited."
Basically, this means that a top/bottom tank (vertical flow) radiator cannot be replaced with a cross-flow radiator and the hose inlet/outlet located must be in the original configuration. Most cars were available with heavy duty radiators, which typically had additional rows of tubes, therefore I don't think that there is any restriction on the thickness of the radiator core used.
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