Ken,
I appologize if I'm writing something you already knew, but I wanted to make sure you are aware Edelbrock sells an intake that will work in this application:
Ford 351 Cleveland V8
VICTOR 351-AH II (4500-8500 rpm)
Designed for NASCAR tour engines, the Victor 351-AH II is designed for raised-port heads used on 351-C low-block Ford V8s. Fits SVO racing block with 9.200" deck height. Will not fit cast iron Cleveland heads. Waterneck section cast into manifold.
Victor 351-AH II #2990**
For use on a Cleveland block, the Windsor water neck can be removed from the intake with a little careful sawing/grnding. The bottom -rear of the manifold is designed to mate with either a Cleveland or Windsor block, so you can cut it to match the Cleveland block and its ready to go, no welding or machining necessary.
I thought this info might be handy if finding the A331 intake is a problem.
George