Well I've decided... sort of

IMHO, ....and this will surprise some because I am a HUGE 904 fan, but I would run the A518. You say you are wanting to go 11.50. I think the A518 can do it more cost effectively. Besides that, once built and built correctly, you will literally never ever have a problem with it. Yes, the 904 based transmission takes less HP to drive and is lighter and all the other arguements I have given in favor of them, but when it comes down to it, the A518 is a beast and will last forever. GM 200? did you really say that?