I'm looking at a set of 346 heads to go on my 400. 88 cc open chamber, 3 angle valve job, ported, new seals and HP springs good to .520 lift. 2.08 int 1.74 ex. My 400 bottom is stock. I'm looking at pairing this with the Engle K-56 cam that Chryco recommended in another post. Right now I have a Performer 383 intake and 650 Holley. How do these heads match up? Right now I just have stock heads with a 3 angle valve job.