stock per nhra rules is supposed to have the correct journal size, super stock is allowed any size journal, that being said yours may vary
I looked in the rulebook more and I agree:
BLUEPRINTING Permitted per NHRA Specifications available from NHRA Technical Services Department headquarters. Stock, factory OEM components (unless otherwise specified) must be retained and remain unaltered (i.e., connecting rods, pushrods, crankshaft, etc.).