I'm definetly no expert in this area as I'm very small time amateur. However I have been following this thread with interest. My uncle campaigned a 72 Chevelle down here in the DFW area 3 years ago that was running at first a Pat Musi, then Reher Morrison, and finally a Merlin. He would always laugh when we would talk about his "Chevy" engine. He said that the only thing common with a Chevy engine and those engines was the bellhousing. Otherwise there was nothing "Chevy" about it.