Forumers,

I dropped a newly rebuilt 383 into its place in ´72 c10 project I have. Engine would turn fine on the stand, then i bolted the flexplate on and dropped it in the truck, bolted the bell housing to the engine and when it was time to hook it to the torque converter it won't budge. The engine would take some force to turn before, but not excessive.

Torque converter spins freely, Ive already removed the sparkplugs. Im using a pair of wise-grip pliers to clank on the flexplate. What is my next step here?