Run the 289 heads because you will gain more compression because of the cc's!!! 1969 or 70 302 head because of the small cc's!! The only thing you gain from either head is compression!! Neither head has no bigger valves or flows better than the other!! The compression with the cc's is the difference!! And no, not a late model 302 head!!
I have a set of fully ported 66 289 heads with big valves I'm needing to sell!!Having them reworked as we speak and am willing to let them go cheap since I bought a set of 2500 Canfields!!!EMAIL ME! [email protected]