4 speed bellhousing
I used a stock 11.5 inch bell housing I believe on my 440 4 spd.
I think it was 11.5 anyways. I know I used a stock 318 flywheel. Don't know about scatter shields.
Think it could also depend on motor mounts or motor plate. I think you might be able to use a bigger bell with motor plate. Could be whrong. Jim lusk should chime in, I think he knows