Car won't run past 60mph

Are you getting into 3rd gear? Those numbers sure sound like 2nd gear. And it's the front clutch pack that wears out and causes no 2-3 upshift.
Yes i get all three gears but it feels like something is holding the trans back. I also don't think its totally slipping either. I can from a dead stop gas it and it runs right through the gears but at 60-70mph the motor just seems its trying to hard to move the car. I also notice while backing in reverse it seems to take an unusual high rpm maybe 2000-2500 rpm before its grabs likes that when it stalls and grabs. But in drive it grabs around 1200-1500. Its trial and error, these are the things you deal with when buying a unknown motor and trans from the junkyard and just take a chance on it performing. So far the motor runs great I just got to get it tune a little better. I keep playing with the timing to see if it makes a difference so far no luck. Right now im at 10BTC all in at 2500 total 34degrees but i just tried hooking up to the manifold vaccum to see by chance it would run better. I honestly think im pulling to much fuel pressure for my carb so I got to check that out as well.