i dont know about the clearance on the strut tower on the Cres, but I dont see why you cant put the 7mgte exhaust manifold on there, some 440s, a ct26, an MKIII intercooler(get some pipes made), and just do the NA/T swap... also re the driveshafts a little shorter on the w58 as aposed to the r154 i cant remember.

-ian