The first thing I would check is the fuel pressure. Check it with a gauge. If it is on, check for spark coming out of the cap.
SOURCE: 1997 chev 1500 with 350 vortec milky oil in dipstick tube
Sorry to say its your head gaskets. Probably from the overheating it wore out the gaskets. that milky stuff is your coolant mixing with your oil. Good luck. Suggest you take it to a pro. the gaskets are easy to change, it's everything else in the way to get to them that requires special tools and experience. Let me know how it goes. I have the same thing with my truck but not real bad. If your truck is running smooth and doesn't feel like its missing, or when your start it no puff of white smoke comes out your exhaust it's not that big of problem. if these are happening then i would get a quote.
SOURCE: I have a 1985 Chevy C/30 pick-up with a 7.4L 454.
85 with TBI only needs 13lbs of fuel pressure. verify that the fuel filter is clean. there is no easy way to ck fuel pressure, special adapters are needed, I dont have info here at home but there should be a relay for the pump, on the firewall and the oil pressure switch also powers the pump. did you replace the pump trying to fix this problem or did you just mention it to help troubleshoot the problem? verify that the fuel pump wiring has a good ground, should have been a eyelet that bolted to the frame..when you initially turn the key on, you should hera the fuel pump power up for 2 seconds, then go off, after the engine starts, the power for the pump goes through the oil pressure switch.
SOURCE: 1970 Chevy 350 in C30 truck dies when warm
You need to find oput what you loose when the truck shuts off, all you need is Air, Fuel , and spark to run one of the three are droppuig out when it stalls and will not run. Chech the carb for gas it sounds like you have a weak fuel pump.
Testimonial: "Great idea...I assumed that because the line was full of fuel when i checked the bronze filter element. Fast response, thanks!"
SOURCE: engine swap 5.0 vortec to 350 non computer controled
5.0 heads will not work, most likely not the intake either.
SOURCE: I have a vortec 350 setting a trouble code P1345,
p1345 is a crank/cam sensor correlation fault possibly due to a
failure in this solenoid.other possible causes include engine timing
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