Another option which i have done to my cologne in me 100e, is to over bore 60 thou, 2.9 crank to stroke it (have to modify the nose to allow you to run timing gear instead of chain), you also have to deck pistons cause they come out top of block , change to steel gear at this point to. lightened flywheel, cossie clutch, V6T6 (hairy) Kent Cam, high pressure oil pump, standard 2.8 k-tronik injection. Tubular manifold 2 1/2 in system. Dynoed at 176 BHP, 211 LB/FT Torque, just pulls and pulls right through to 6000, no idea how much for conversion but was money well spent.