79machocharger,

Perhaps the following will be useful in your decision. I helped my buddy change the heads (906 w/larger valves) on his 3900 lbs., 1968 440 RT recently. His motor consist of 10:1, Lunati Voodoo #60302 262-268 cam, Performer RPM intake, BG 750 Mighty Demon, headers, 727 w/3000 stall, 3:55 SG.

The 906s that were removed were in good shape and had upgraded springs. Heads were rebuilt a little more than 1 year ago. On went the Stealth heads using prior rocker assembly (roller 1.5). Stealth heads were untouched and simply bolted on. Timing is 36 total.

In March the car went 13.9. May 2, car ran 13.55. I believe the mph was up 3 or 4 mph with the new heads. Car is more responsive with the new heads. Weight dropped poundage off the front end too.

Hope this helps.