Hey guys I could need some help to decode this tranmission. The seller told me it whas in a 1968 Camaro ? What i have is; Saginaw 4 speed 2 grooves ; 1st. 3.11 sec. 2.20 Third 1.47 fourth 1.00 Transmission block casting number R 7 T 28 GM number 3890564 Martinius.