First of all, I swapped out the old 305 for a 355. Problems are that in the morning or when the car is cool, it starts up quick, like 1 or 2 seconds of cranking. When I let it heat up for about 10-15 minutes and try to restart it again, it takes like 5-8 seconds of cranking. Another thing is that when driving for a while like 30 minutes, it starts hesitating alot all throughout the rpm range. At a stop, it is ok, but once i give it gas it bogs down and goes. This only happens when it starts to heat up. Talking bout a lil over the quarter mark on the guage. I'm guessing, ignition. Still stock and autozone parts mixed in it. Think I should step up to whole new aftermarket distributor and coil? Or any other ideas of what might be wrong. Car was custom tuned after the new engine swap.

 

Sounds like the ecm thinks your engine is cold all the time. hook up a scan tool and see what the temp sensor is reporting to the ecm.