We bought a new 350 block and put it in with all of the old parts. New: plugs, wires, rotor, distributer, radiator, hoses, fuel pump, re built TBI, ect. when it first starts it will idle fine. but after a couple of minutes it starts to cut out like its starving for fuel. i do not know what the problem could be we have tried everything we can think of if you have any ideas or answers that may help please email me using the send comment link. THANK YOU