I am swaping out running 312 for newer engine. It is from '57 T Bird. The Engine has a 4 Barrel Holley and headers. The Engine  is in a 55 Ford Pickup and runs good. I bought the truck with the engine in it and do not have any history.
I put in the Fordomatic and  Locar shifter. I also have a 9" Ford rear end for sale. I will seperate but prefer to sell the complete package. The parts are located in Englewood Florida. I have more photos and a video of the engine running and the truck driving. Call with offers or questions. Tom 941-999-7810