I have built 2 smallblock s-10 trucks and just to be honest it is easier to just order the mounts and the headers to match. if you don't your headers will bind on the steering colunm when you torch on the motor.
thanks for this info...i have another s-10 with a 4.3 l ,i was thinking of taking that transmission since there is only 86000 km on the engine,transmission and tranny support,i will post some photos soon of my projet,im also building a unique body...
Bob , it's not so much about measurements as it is about angles. You didn't mention what transmission you are using or if its 2wd or 4wd but you will want to insure that you have the correct trans output shaft to pinion shaft angle to avoid vibrat...