Need some advice on a truck cutting out, weak going up hill.

[anx]

I have a 1980 chevy k20 long bed with a 350. have had it for a couple years and its been a great truck.

Latley it has been cutting out almost stalling on heavy acceleration especially going up hills. Ive changed the plugs, wires, cap, rotor, and fuel filter. none have made any difference.

Truck starts and idles great. runs pretty normal at low speeds. i have been avoiding any hills to and from work. but i would really like to get it right again.

I am thinking maybe fuel pump or vac advance in distributer or maybe the carb. but money is tight and i thought maybe someone would have some advice or thoughts before i just start spending money guessing.

Thanks for any help!