I've got a mint 84 vette with only 18k on it. I have been thinking of dropping in a new engine cuz as we all no its slow. my delima is that the car is in great shape and might be worth something some day. do i leave it stock and not drive it or swap the engine and ejoy it now? I was thinking about putting an Ls1 in. would this fit? Any advise would be appriciated.