This sentence combination seems to be illogical:

"Case-by-case approval of engines over 3.2 liters from "Pony Cars" or "American Iron" with stock camshaft lift at a heavier weight will be considered. No engines over 4 liters shall be allowed under any circumstances
American Iron cars will have engine displacements over 5L, in fact, they start at 5L. So the first sentence says they will be considered, the second says that no engines over 4L will be allowed under any circumstances hence negating the first sentence.