Help!!! I have a "ran when pulled" 350. Last time it was in a car it was driven home. Double hump heads, been rebuilt somewhere along the line as rod caps are all #ed. When i got it, I installed a new camshaft and geardeive. And roller tip rockers Now, I've got the motor in the car, valve's set to tdc, no flash the. 1/2 turn. I can turn it manually by crank. Put a starter on and it will only turn the motor with the plugs out. Plugs in and it really struggles to turn. Battery is fully charged, used 2 new starters, 1 later model factory small style, and 1 factory high torque. I've disconnected the torque converter just to be sure. Same thing. I'm not a motor guy, I'm trying anything I can to not pull this motor, car has show quality paint job on everything and I hate to risk it. Please, any ideas?