Motors bogs down

Hello all. I have a 318 I stuffed in a 1950 dodge truck. I'm restoring the truck myself. The motor was bought about 2 years ago from a fella on craigslist. I had the motor running last summer when I had it sitting in the frame of the truck just to make sure it ran good and it seemed to. Fast forward to now. Body work is a done ,wiring us also done. Now I want to make sure it still runs before I plan to paint next week. When I turn it over it seems to bog down. I put in New plugs , New wires, and high torque mini starter yesterday. It's got a hei Mopar distributor. It also hasn't fired. Could it be a weak battery? Or something I'm missing. Thanks for any help. (Btw the motor is out of a 1971 dodge dart, alum intake, edelbrock 4 barrel carb if it matters.