69 gmc sputters and dies when hot

[rmahaffey]

First off i am not a mechanic but am fairly handy. anyway i bought a 69 gmc as a project and have been slowly working on it. previous owner was a mechanic who said engine was rebuilt and running great (now highly doubting that) finally ready to drive and when i get on the road it runs great till it gets hot then starts to sputter almost like it is not getting gas and will eventually die. if i pull over and let sit after about 5 to 10 min it will restart and drive until too hot and does it again. i have now replaced the fuel filter, distributor, fuel lines from carb (real close to block thought it was vapor lock) just ran again today and still doing it! help i am about to scap it and do something else!
Rob
(frustrated novice)