As for the engine all Y-Blocks pretty much look alike. Checking my very old Motors Repair Manuel they list three engines for the '57 T-Bird. 292 cu in with a two barrel is listed at 206 hp. Two 312's, a 245 hp single four barrel and a 265 hp with two 4 barrels. What is not listed is the Super Charged 312 offered later in the model year. Since this is an AMT kit I think you could raid on of the old '56 or '57 AMT Ford kits for just about anything you might want to add to this engine. This could become very interesting.