On the Brewer's site it looks like the 1970-1971 E-body/1971-2 B-body big block applications with 10.5" bellhousing use the same and the 1966-70 B-body big block, 1970-74 E-body & 1971-74 B-body small block use the other one.Does anyone have a measurement on a small block car and a big block car so I can see with one I have?