2 issues on 69, one with Quadrajet and the other a temp gauge...

[Kw69]

Hey guys, this has me stumped some. I have a new GM 350 crate engine dropped in on the truck that I bought recently. Has a new Quadrajet 4 barrel installed as well. Starts perfect in the am, but after running it around town and shutting it down for a few, it does not want to fire up. Just cranks and cranks and May fire but takes a few times. What's causing this? Has a new fuel pump, I mean everything is new...except the fuel line leading to the carb its original I think.. So I am slightly stumped cause I had to admit being only 42 and working on cars most of my life I have very little time working on Carbs... So what ur thoughts? Oh and on another note.... The previous owner also installed a new cluster with a tach. All is good except the temp gauge does not work.... I fixed a slight break in the wire but no avail. It does have a rapid fire coil and distributor from LMC. So two part question but both have me scratching my head... Thanks guys in advanced..