This engine is a 1978 440, so compression is in 7.5-8 likely. I have a Hughes Whiplash 440 cam. Timing is 20 deg initial timing and 38 deg full in I believe. The heads are stock 452. Fenderwell headers. The Weiand tunnel ram with twin 660s. Strange combo, but it works very well, especially with the 3.91 gears. This gear change was for the road trip so that and the air temp is what is new. I did order a new radiator to help with engine coolant temp.