A friend and board member did the magnum head swap. Kept his LA intake so had to drill the heads. But wow, that 318 with those heads would have slapped my bone stock 360 sideways so bad it would have been like I left the emergency brakes on. IfI had driven that 318 car before putting my 408 in the works, I'd have just gone that route I think. If you can do the head swap, that really will give a lot of both ponies and saves $$$ on intakes.