[Magoo]

Why not let somebody reputable rebuild the motor, seems like you always go to the unknown shops and get screwed man. IIRC the Aluminator only carries a one year warranty, has unknown piston's, and is only rated to handle about 700rwhp max. But if you're set on buying it Steve @ Tousley can get it for $6100 shipped.

I say keep the 2.2 and throw some good boost at it, get a stout fuel system, and convert to E85. Hello 700+rwhp on cheap pump gas! The IRS is fine, plenty of guys are running sick sick times on the totally stock rear. Just don't go out there on street tires and try to launch like a bat outta hell. Keep some nice slicks out back with a thick sidewall (ie: 15" or 16" wheel") and you'll be fine.

But I will toss in a vote to sell the Mach and get a C6Z, they're dipping down the mid-hi $30's if you look hard enough!