I am in the process of putting a GN motor in a 63 chevy II. I tried it with the original front end but had HUGE issues. The pan hit on the steering and the exhaust manifolds had a major clearance problem. I purchased a front clip from Checkered racing and all those problems are gone. But I did have to do some customizing with the down pipe because the width of the frame rails on a chevy II are very narrow. I bought the 5" down tube kit from RJC racing and fabbed a custom downtube from the first bend off the turbo out. It looks real nice. I can post some pictures if you would like to see them. Have a good one,Turbo6man