For 5k, my friend got a 347 built with aluminum heads(trickflows)ported and installed, but it is not emmisions legal, i dont think anyway, plus it's carbed, since you might not know, a 347 is a 302 (5.0) with a stoked crank, as in more cubic inches-more power.
You can shop around, engine building shops sometimes have good deals, but you would be well off with an explorer p-head motor.
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