Hey Nick, Call this guy. He might make you a deal on the whole longblock. He may sell the heads separate too.
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I have a 91 302 unknown miles, when I did the heads last spring it still had cross hatching in the cylinder. E303 cam, gt40 heads(not p heads), carries 30 to 35 oil pressure at 180 degree f. You can come hear it run before I pull. The reason for selling is building a new motor. I also have video of it running on my phone that I can send. I will be keeping dizzy, intake, and carb. 500 bucks takes it. 937-474-7330 I have pics in my build thread of the motor