Valley pan for Stage VI heads

Well if I can't get the spacers to work right, I'll use an M1 intake from a 440. Then I won't need the spacers, right? Then do i use a 440 valley pan? But It's a low deck block. I think I would still have to cut the port area off a 400 valley pan, and use the paper gaskets over the port? This is harder to figure out than I thought it would be. LOL. This is the kind of thing that happens when you try to get 1 part to do 2 jobs.