Please help

[ryan hunter]

I have a 77 k20 with a sbc350 a few months ago it was running rough so I changed the spark plugs,wires, distributor cap,and rotor. After that it ran fine for about a month then it ran out of gas and hasn't started since I added gas to both tanks looked at all spark plugs cleaned and checked for spark again and also made sure the distributor cap was on good and all wires were right. After that I looked at line going from fuel pump to carb and there was gas squirting out so there's pressure. Then after playing around with stuff it started and ran for about a minute with rough idle. Then it hasn't started since. It really wants to start but won't. Any ideas? Any help would be appreciated.
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