Hard starting?

[Squareforceone]

I have no idea what's going on here. I put a new motor in my 84 and ever since have had nothing but problems.. Motor is a 357 and it seems to run good but it starts terrible it never likes to start after it's been ran awhile it just turns over dead slow. I've checked the initial timing, put on a heat sheild to protect the starter from the headers and still the same problem. I thought the battery maybe the cause as the one that's in it was junk but nope and heres where i get confused. I took a brand new battery out of my daily driver and put it in the truck and it did the same thing. Put it back in my daily and it wouldn't start that either my truck had totally drained the battery. I'm stumped.