[Argess]

I've only had "low revs/low power" for two reasons:

1/ Timing gear was off by 2 teeth......I didn't do it....a Machine Shop did it on a Chev 350 for a freind's boat. I just helped diagnose it. Never-the-less, I have caught myself one tooth out after a doublecheck on timing gears. As above, a degree wheel works wonders. And you can check it with a dial indicator and degree wheel and only have to remove the passenger side valve cover and the crank front snout bolt.

2/ Overly advanced ignition timing...the enigne will feel like it's fighting you...or overly retarded timing, and it will feel ...shoot,, i don't know...LOL...but I bet it will be sluggish.

EDIT: Oh, there's a numebr 3, but I'm sure it doesn't apply to you. Again, in a boat (which is always under load), I couldn't get over 2800 rpm. Felt like a rev limiter was in action. Turned out to be worn wire-tip sparkplugs. Once I hit a certain load req't, the plugs wouldn't fire. I went back to stock style plugs and never a problem since. But I'm sure that's not your problem...just an interesting tidbit.