swapping heads, does it work??

[97snakedriver]

I would think ATLEAST 50 and probably more like 70. You get a heads/intake which is otherwise worth 260 over 215, plus you bump the compression up quite a bit. I'd imagine this is a premium gas only affair afterwards.

But I think you either need to replace or modify the intake manifold to fit it. But as long as you have the engine pulled apart that should be too big of a deal.