340 cam change

What I would do is get the stock replacement 340 springs. There have been people who had trouble with the 901 springs hitting the rocker arms, including me on a 360 I built several years ago. Get those and remember to, when you regrind a cam, you will probably need longer pushrods. That's no big deal. They are cheap and easy to measure for. We can walk you through it if you go that way.