My transmission has an aluminum housing, with a cast iron case. How beefy is the FMX? Is it worth using over a C6? As for the t-bird 390 conversion, I still havent 100% decided on using it yet. I wanted to sell it but never got around to posting an add. I might go and do that. Anyway, I took the cast intake and one of the heads off to look at the condition of the pistons and they seem decent, I'll be installing a set of new forged pistons, but it seems the 73,000 miles that where on the engine where somewhat takin care of miles. Any suggestions on what I could drop the motor into without too much custom work?