I have a 72 rallye charger that has a wounded 400. I am going to temporarily drop in a 75' 440 from a pickup until I can rebuild the 400. The 440 doesn't need to be rebuilt but I would like to slide in a better cam to wake it up a bit. Has anyone gotten good performance from a smogger with a simple cam change ?? The gears are 2.76 and it does have a small 2000 stall converter ,,,, everything else is stock.. Any ideas ????