hard cranking after warm

I have a 71 scamp with a 318. I have the fitech fuel injection, 360 heads I'm assuming the stock 360 cam not 100% sure though. I'm going through and setting up the fitech for cold starts which is now doing a lot better, but after the engine warms up to temp and I try to restart the car the engine has a hard time cranking over like my battery is almost dead. If I let it cool back down it starts up fine and turns over fine. Any thoughts?