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I got the info I posted from Edelbrock's site. FE heads came with 2 different port sizes in their low risers; don't confuse the short low riser port with medium riser ports, although both will, as you say, cause a mismatch, but will work. Cobra Jets and 427 low riser heads both used the tall low riser ports; 390s came with both tall and short ports. The Edelbrock 427 heads aren't actually medium risers, as the combustion chambers are smaller, which is a good thing. More info, if interested, can obviously be acquired from Edelbrock.
Good Luck,
Dan
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