You should not have header clearance issues with 1 1/2 unequal shorties. I have 1 3/4 longtubes in my 351 car and run motorcraft 450's or autolite 24's. Gapped at .054. In my 302 car, I have BBK equal length shorties with 1 5/8 primaries and the same plugs with no clearance issues. The stock wires are angled 45 degrees. What kind of wires do you have?
BTW, I have better luck with the autolites over the motrcrafts. Autolite gets my vote. Bosch supers suck ass. Even Champions are better than them.
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