I have a 318 in one of my Darts that is mated with a 42RH 4 speed OD automatic, and has 2.94 gears. 8.5:1 compression, Edelbrock Performer intake and a 650 AVSII. It is a long distance road trip car. I believe that the current cam is not serving me well - 17mpg on the road, lack of vacuum for...