Cylinder Head Swap

[Fostang]

A while back my cousin sent me a set of cylinder heads with fast burn combustion chambers and other goodies. I finally got around to porting and polishing them yesterday. Then today I did the change over. The car now gets going at lower rpm's. The engine seems less stressed at take off. It sounds and runs great. I had my dad test drive it and it almost made me wet my pants at how mean the car sounded. The only thing that I have come to find is that it is running a tad bit hoter than before. I know I put everything correctly so it has to do something with the heads. Any ideas why it would run warmer?

Changing my front coils, driveline, and seats tomorrow. Putting the original seats back in. I have reccaro type right now but they seem to take too much room in the already cramped mustang interior.

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67'fastback-Edelbrock carb,intake,cam,valve springs.Rhode lifters, CompCam rocker arms, windage tray,cerama coated headers,dual flows with H-pipe, modded c-4,tci stall converter,perma cool electric fan,aluminum water pump,griffen aluminum radiator,accel 8.8 cable,wide cap distriburator,magnetic pick up,v-matic hurst shifter,edelbrock performer nitrous, carter electric fuel pump,ignitor coil,solid motor mounts,magna racing suspension,poly urathane bushings,under rider traction bars, comp. eng. s