I got a 350 in my 75, need to now what year it is so I can get a kit. Dipstick is on the Passenger side, so it must be later than 81 right? I actually think its an old crate moter, says GM-Goodwrench on the valve covers. Also, is there a way to tell if it is a one peice rear without getting into it??? That is 86 and on right?? Thanks guys!