Originally Posted by JaredOSU
Do the gt40 heads need different valves or cam to operate correctly? How about the exhaust?
All existing parts should work. Just drill out the head bolt holes, bolt the cylinder heads on, check lifter preload if within specs put valve covers on and call it a day and enjoy your new found 20-30 hp. If you want the heads to operate more smoothly you should replace the intake manifold and if you want more hp replace the camshaft although replacing the camshaft can open a can of worms. Lots of threads on here already about different guys using different parts to achieve more hp and torque...