dont 351 windsor heads "drop" your compression when installed on a smaller 289/302?
and dont you have to drill all new/enlargerd "head bolt" holes?
and since you would now have enlarged intake runners on the heads, does anyone make a (required) 289/302 intake that would match the ports on the 351 heads?

sounds like a lot of "expensive" heartache and trouble to me.

the original question was available "aftermarket" heads, available.
i dont know where compression ends up, but a friend of mine installed "trick flow" heads on a 302. its a really badass car. but he will tell you that the 2.02 valves were overkill. if he knew... he'd have opted for the 1.92 valves instead.

also, the edelbrock heads seem to make a lot of sense. at least you can get a matched package. (cams, intakes, carbs, heads, etc). also, the edelbrock heads address all the weaknesses of the standard 302 head.
it may be somewhat expensive, but it eliminates most of your guesswork.