Easiest to fing would be E7TE(87-up mustangs and truck 302's).
Harder to find but good to better heads- C8OE-C, DOOE-B, D1TZ-A.
351 Heads work but you need to put sleeves in the head bolt holes as they are larger than 302. Or you need to machine the block to accept the bigger head bolts. Get pre 78 heads as the CC is smaller 60.4 vs 69.
The first letter is the decade C-60's D-70's E-80's. The second number is the year of that decade.
Hope this helps!
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82 Mercury Capri 302, Comp. Cams, Tremec 3550, 3.73's, 12.8@106 N/A
Kevin's Capri
Kevin's Mustang