How much clearance between engine and radiator---should be lots. You would have to relocate trans shift tower hole and custom bend shift lever, neither a biggy. Modify clutch release rod to throw out arm, side mount engine with adapters to use old style motor mounts and fab brackets to run the two inches back to the mount holes on the factory cross member. Don't remove cross member if you are using leaf springs. I believe this would be easier than making or buying a recessed firewall. You will love the LS power and fuel mileage.
