When I decided on the engine,..I had no idea it was capable of the numbers I'm seeing, but evidently a turbo makes up for alot of the engines short comings. The head was the problem,...requiring a major restructuring of the inatke and exhaust mating flanges, and a complete custom induction and exhaust from there. That changed today when i bought the Australian Crossflow head. The head is still probably only good to 5500-6000 rpm, and for my purposes,..that'll be fine. All this to say that I'm seeing guys making high 300's to low 400 HP numbers at like 4400, w/ a blow through carb on a log intake..and close to 450 RWTQ starting at 2700 rpm because of the 3.91 stroke. I'll be injected if that's worth anything. What's that got to do w/ the control arms,..well every thing. I will cave into either a Steeda, or UPR street set w/ solid lowers and adjustable uppers.