340 stroker help?

I agree with everything said. 220 cranking is up there. You would need a very short, very slow advance curve with lots of initial. I would wait for the specs and cannot make a better suggestion until more info is provided. My personal fave thing to do would be to machine a custom dish or something like that into the pistons-provided the pistons lent themselves to that. Other than that I would consider a cam change or at least degreeing it to verify that you do not have an extreme amount of advance in there right now. More info. J.Rob