The millennium heads have an adapter plate that comes with them. My buddy was using an Indy tunnel ram intake for it and 1 1150 dominators. Apparently it was making 920hp from a 477 engine. Ya your right, just gotta get the heads to make sure it’ll clear, and if it doesn’t then so be it, notch it more. This might be a stupid question, would you take all the pistons out to do it? Or just mask it it up? Thanks.