I don’t have too much info on a friends Nash in a street-race 68 Camero (1970s) , 331 cu in modified production engine from Rhere & Morrison. Very high RPM engine, never really knew how fast because he bagged all the time looking for suckers money. 6.50s in the eight at will. Point is he never had a problem power shifting that trans in the 7500-8500 or more range. Can’t think of R&M drivers name right now who did the heads.
If it was an early Doug Nash box shifting that high RPM there were no syncros in it . I'm not sure when they came out with the "street" 4+1 syncronized deal but I'm pretty sure it came along in the mid 80's
Gus
