A couple of things. Do NOT under any circumstances go to a 915. A waste of money and time. Although only a four speed, you definitely want to go with a 930 gearbox. Flip the ring gear over and everything bolts right up. There are several very competent players out there that can do this relatively inexpensive conversion for you and you are good to go. It is bulletproof and shifts like a dream.
Secondly, consider very strongly the possibility of putting a Subie WRX STi motor in that thing. Light and powerfull as hell. I am convinced that if the "old man" had had good turbo technology available to him in the 60s they would have built a turbo 914 then. We have done one and it is amazing. 360 ft lbs of torque and 360 hp. All you will ever need. And that is in stock trim (although the experts at Vermont Sports Car reco'd changing pistons and rods for longevity which we did.) Car runs right along with the GT3s.
p.s. Don't forget to do a half shaft conversion on the car. Late long hood 911 stub axles (108mm) with 930 CV joints. Shafts best if they are 300M. Sway a way makes the shaf. Mckenzies Peformance in Ahaheim can put the package together for you. Get the "prepped" CV joint while you are at it. Not that much more $.
