Need advise bolting a np445 to a 325 poly

If you could find an old hemi or poly truck bellhousing and flywheel you might be able to make it work. The trouble there is it would have used the old 420 transmission, which has 10 spline input and a little different bolt pattern, weird starter, and it will be a huge iron housing with mounts on the side. The adapter to the LA stuff would be better