urh, urh urh!!, check this out Mercedes has already took the 3.2 m112 and bored it out, thus creating a 3.7 Liter pretty damn cool!!!
Look at where the Torque numbers are at, 3,000 - 4,500 rpm, man is that sweet!

http://en.wikipedia.org/wiki/Mercedes-Benz_M112_engine

The E37 is a 3.7 L (3724 cc) version. It retains the 84 mm stroke of the E320 but is bored to 96.8 mm. Output is 235 hp ECE (173 kW) to 245 ECE (180 kW) at 5,750 rpm with 254 ft. lbf (344 Nm) of torque at 3,000 - 4,500 rpm.

Start scrounging for wrecked ML320's that motor could easily make 300 bhp without a sweat, otherwise Bore and sleeve a m112 block and order ML320 pistons. MBZ also has an AWD version, though I doubt any of it could fit under a crossfire's chassis. Would wild to have an AWD Crossfire, lol.