Ford has waaaay more variety... FE/sideoiler, Windsor, Cleveland, boss, CJ/SCJ, 385, M, MEL, Romeo and Windsor versions of the SAME 4.6 engine just different enough to not interchange anything cobra 4 valve, coyote...

If you ran that same pole on other mopar websites you will get very different results. Like I said this is an old web site with old people stuck in their ways (if it was not in the 77 DC catalog it don't count) so the oldest engine wins even with terrible valve placement, terrible plug placement and a horrible rear main seal