OK, so they are both (sets) are high compression (75 cc) small valve press-in stud heads. Like suggested earlier, you could have the studs replaced with threaded studs, or have them pinned. The studs that are pulling out would have to be reseated and the pinning process costs about $5.00 per stud to do, so about $80 to $100...not much more money and you've paid for the better threaded studs. I do like the idea of finding some 6X-4 heads and a Summit 2800 cam for torque. That would lower your compression ration to a manageable 8.5 in a 400 or 428 (with dished pistons) at around 90 cc's when cut a bit.
Dennis
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