I have that same SVO motor, 345HP X303 alum heads and B303 cam, and a Renault R21 turbo gearbox. I have installed a RPM performer intake and a 750 holley doublepumper. This motor has plenty of power for these cars and the gearbox seams to take this power level well. The 3.44 final drive in the R21 type boxes make this the one to own in the renault lineup. At a freeway speed of 70mph the motor is turning 2350 rpms in 5th and 4th gear is right in the meat of the powercurve about 3200. It will pull VERY hard on the downshift and still is turning a very easy engine speed for crusing in 5th. I would advise that if you use this setup you should get a bellhousing that can fit a full size ford flywheel. This will allow you many clutch options. You can expect to spend about $3000 to buy this motor and about another 500-1000 to complete it with intake man, carb, timeing cover, waterpump, distributor etc. The rebuilt Renaults cost about $3000-$5000 depending on upgrades.They are hard to find in the USA used and thats why a lot of people ar useing Audi's. Audi's are a lot cheaper. Oh and I have set my rev limmiter to 6000rpms. I think that the hyd lifters will not suport much more that about 6500 or so.