A few 351W heads are noticably better than the E7TE's. Not a whole lot though. They use 1/2" headbolts so you'll need to pick up an install kit because your 302 uses 3/8." There are some minor tweeks to do for the coolant passages as well.
You'd be better off picking up a set of ported/worked E7's for $200 IMHO.
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