I would like to thank everyone for their advice. The rear end project seems like a good one for me to do. I agree there seems to be a problem with my cam/vacuum. Does cam timing involve taking off the timing chain? advance or retard the cam relative to the crank and see if things improve? I'll look in my shop manual. I have ranged my distributor back and forth to change the timing but can't get the vacuum up that way. Thanks again, Bob