[bigblockv6]

The Mr. Gasket #1937 adapter won't work with the trapezoid base 351E Magnum manifold, A few years back I machined up 20 or so adapters for the trapezoid base manifold and sold them off to the members of this site. A few have switched over to 4bbl carbs so someone may have an extra adapter. Another alternative is convert your existing manifold to a 4bbl, it's a relatively easy procedure that does not require welding.