302 heads

im still digging for some good heads for my 318 build and don't wanna do the magnum swap for various reasons. im trying to find some 302's or maybe 308's from what I can find they are similar or basically the same. what are the chances of them being on a late 80's truck motor? if not what all can I look for them on '85 and up to ?? 318 motors would they all be fuel injected motors at this point in the 80's? thanks