Another 318 carb issue!!!

Hello friends!!!!

Long story short, 72 Duster 318, Eddy performer cam (.420 lift), Performer intake, Eddy 600 CFM, mechanical choke, headers, and pretty much stock motor. Less than 5K on the rebuilt 904, 8 3/4 with 3.55 gears. Sat for a few years, drained the gas, plugs and wires. Starts up ok, but it is like pulling teeth to go over 60 MPH. She sputters and sounds like she is missing real bad.

What I have done so far - rechecked all the wiring to the plugs, checked timing, air fuel ratio, timing again, air fuel again... When she is running the idle is smooth bt 700-800 RPM. Under any load she lags and sounds crap. Any ideas???

Thank you ahead of time,

Danno