If you go to a V8 you'll have to change the front motor mounts and I think move the steering box. The early V bell housing will bolt to your trans and you can use the clutch linkage. A 235/261 will bolt right in. A 250-292 will be the same as a V but you wont have to move the steering box. This assumes that to put the 235 in your truck in the first place the radiator was moved forward. If the short water pump option was used it will have to be maintained for the 235/261. The new sixes will require the Radiator to be moved forward 1 1/2". If that was done to fit the 235 then a 270/302 GMC will bolt in with a front motor mount change. This is with no trans, drive line or rear end change. These old rear ends are really pretty tough, trannys not so strong. Patrick's makes an adapter kit to fit a Saganaw 4 speed to the closed drive line and also 3.55 gears for the rear. Going to open drive line is not too hard as many rear ends are easy fits. As was mentioned you are at a point where there are many options. Decide what you want your truck to be and we will do what we can to help if you stay INLINE.
Beater
