Engine stalling on 1987 b2000

Engine stalls and cut off after 10 to 20 min. of driving. I have rebuilt carb.,replaced carb.,new fuel pump, new fuel tank, replaced spark plugs, replaced distributor cap and rotor button,replaced coil. I have been told it could be the head, any help or suggestions would be greatly apprieciated.

pull the gas tank sounds like you have something there prolly the a lil cardboard peice from fuel additive....trust me i have been through all of this let me know if it works.....

hahahaha cardboard, that must have sucked but given u a good chuckle.