Picked up a 440 and trans from a late 70's motorhome with 58k miles. It is a van type chassis. The engine code on top is 7t440e. Anyone have any info on this motor? I'm thinking it has 452 heads. Would the cr be lowered with dish pistons. The manual lists the cr at 8.2/1. I'm guessing actual would be about 7.8/1. I have a couple of sets of 66/67 383 heads with closed chambers. Would they (with the bigger ex valve) bring it up to a reasonable number for street use? Any help will be muchly appreciated.