won't start

have a sbc 355 with a slayer 600cfm carb. this thing starts fine in the morning but doesn't like to re-start after it's been driven for awhile. Starter will turn the motor over and will eventually start but have to crank it over 2 or 3 times before it'll fire up. Seems only to have started...

So I bought a 1988 Monte Carlo LS 4.3L three months ago from the original owner. It only had 51k miles, didn't have a dent one, all chrome was incredible & the interior was immaculate besides a crack in the dash (sat few blocks off the ocean in Florida sun). Car runs great (when it's running)...