Just bought an Edelbrock Performer 1403 carburetor for my '65 Skylark 300ci engine. Have a stock 4bbl manifold I bought a year ago. Believe these manifolds originally used a square bore AFB carburetor. The Edelbrock is a square bore carburetor but it's bore sizes and spacings are different. Is there an adaptor that will work for this combination and if so where can I find one.