Square port BBC gaskets are a perfect fit on the 426 Hemi head. I have to admit for cheap power the BBC is hard to beat. There are Mopar advantages like the deep skirt block, external oil pump, long rods etc. but if you want lots of power cheap, the BBC will do it. The 426 Hemi and the BBC just make more power as you add camshaft and better breathing on the intake and header side. The BBD needs careful selection of camshaft to work with the small heads.
