Running Hot

Mike, yes, lean condition will cause more heat. Timing will as well.

Question for ya. Are you running the bypass hose to the manifold on the M-1 with the electric pump? If not you will have some heat build up from that as well since it wont be moving the water out of the manifold and upper areas as efficiently. Just a thought.

Another suggestion, fill it throught the manifold to eliminate any air pockets. Sometimes filling it through the radiator won't push the air out of the block/heads. How does the circulation seem with the cap off?

FYI, I run Purple Ice additive and it did drop my temp between 10-15 degrees with a 50/50 mixture of antifreeze/water. The stuff worked for me.