i have finally got all the bugs in my car worked out, but the issue im having is its running hot 200 and up. i put my timing light on and i got 12* base and at 3000 rpm its goes up to 42*. is that to much timing? how do i get it to drop to the preferred 36*? i dont have vac advance dist, and never messed with the weights/springs in it. im thinking thats my overheating problem. any insight?
355 sbc

• aluminum heads
• 9.8-10.1 comp est
• 670 holley s.a
• edelbrock performer cam
• air gap inake
• accell dist
• msd ignition
• ngk plugs gapped to .40
• headers