the engine/trans angle depends on the way you will use the truck for drag racing every now and the (like i do ) you will want the front of the engine down a couple of degrees so the gas in the carb stays off the back side of the float bowl i did this with the osition of the cross member in the frame as for the pinion angle i used some spring shims between the spring and the perch any high pro catalog will have these also depending on what trans cross member you use there can be some flexibility built in my 51 with the small block runs down the road great and also races pretty good
