One interesting fact is that as discussed earlier, one of the first users of intake manifold adapters in the 1970's was Ed Hamburger on his Mopar 340 and 360 Super Stock engines. The adapter allowed Ed to use a SBC intake. Therefore, since the 1970's NHRA has been allowing spacers and adapters in Super Stock class.
As a matter of fact the Ed Hamburger and Bruce Bachelder (former NHRA Tech Rep) Mopar used the adapter with the SBC intake until Offenhauser came out with the SBM Port-O-Sonic intake.
