Help! Newly installed 200 sputters out at 50mph every time.

Ok, got it figured out. The first thing was the plastic sending unit filter was clogged with particulates. Even though I had the tank cleaned it sat for several months before I added fuel. The mechanic removed the filter and reinstalled the sending unit and it revs perfectly. Next thing he discovered was someone swapped the air mixture screw with a standard non tapered screw. So Im getting the carb rebuilt too. So for 500 bucks he rebuilt the carb, adjusted the clutch and shifting bars and removed the filter. The 66 200 incher pulls that van plenty good enough. Thanks for all the help.

I'm glad you got it figured out Hillbilly. Looks like a good van, heavy duty I like that it has the little triangle window on the passenger's side to.

Thanks for all the help. Now that it runs good I can start on the body and paint. Check out these doors I got a couple weeks ago,