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Sounds about right for a 27 inch tall tire @ 2,750 rpm and a 3.42 rear gear. I use this:
(27x2,750)/(3.42x336)= 74,250/1,1449=64.6 mph.
Very nice!!! More pics and details. Is it auto or 4spd??
If you google "1972 Camaro Z28 VIN decoder" the fist 2 hits you get will bring you to the proper "nastyz28" link and will give you all...