You are up against it.
IITC the 400 and 351m have the BB bell housing bolt pattern so they can make a valid point. On the plus side, you can still use a 351c since it has the small block bolt pattern, get the benefit of the canted valves and stroke it out to exactly 377 cubes [img]/phpBB/images/smiles/icon_wink.gif[/img]
[addsig]