I realize most everyone reading these threads KNOWS that Chevy sixes are superior to Fords

but we used the better Offy intake and a 400 CFM on a 300 CID Ford six that was otherwise stock. That was all the 300 wanted. It wasn't too much, but it was certainly enough.
I would concur with Jerry. If you have a trailered drag-car, leave the line at 5000 RPM, and then accelerate; should run pretty well.
Hope your engine is a LOOOOOOOOOOOOOOOOONNNNNNNNNNNNNNNNGGGGGGGGGGGGGGG way from stock.
Good luck, and keep us posted.
Jon.