How can I fix the stalling on my 85 Chevy pickup?

My 85 Chevy pickup 3/4 ton 350 motor starts fine, but when I accelerate it stalls. I have replaced fuel pump, fuel tank, fuel filter, fuel lines, complete distributor, complete tune up, carborater, ground straps, coil and ignition module and it continues to stall while going down the road but always starts back up