Good evening - I have a 66 SS, SBC400, 10.5:1, Lunati street performer cam, 4 speed Muncie, 3:73 rear, that previously had a Edelbrock 7001 performer RPM manifold. With that manifold, the car ran about 180 and temp was very stable. I recently had changed the manifold to an Edelbrock 7501 AirGap, and now the car is running hot to the point that I need to shut it down before it overheats. Slowly creeping up 220, and continues to slowly rise. Have any of you experienced anything similar when installing a 7501? This manifold has 2 water ports in the rear, that the 7001 did not have. Additionally, when I shut it down when it’s hot, the dieseling that occurs is scary. Could this be caused by the block itself getting too hot? Any input or comments would be great.