this was discussed over the years and you may be able to find old threads on it
I think Dana and Nickey/Bill Thomas were both working on 427 Camaro conversions as soon as possible and did them about at the same time.
Bill Thomas was a race car fabricator who did some work for Chevy and was well connected with Chevy Engineering
The hard part of the early 427 Camaro conversion was the headers.
The factory BB was offset forward and to the pass side to fit in the Camaro and had an offset cross member and heater box and other parts.
The SS350 to 427 Camaro conversion used the SB parts. It worked but needed headers as the exhaust manifold would hit the steering box
Bill T was making the early Camaro headers and traction bars and other parts
Dana had an early 427 Camaro drag car
attached a pic of a Yenko/Dana ad from late 1966 and an early Dana/Nickey article
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