I will be able to get a better tune for you this weekend. I have a good exhaust and other than the timing being off a good bit on the bottom end it should be a pretty close setup on the ve table at least.
Adding a turbo to a single compression ring piston won't last long either
Swap to the normal metro pistons with 2 compression rings to get a longer engine life with the turbo. But I figure the turbo will give the car a pretty good bit of power if you add it but it will not help mileage at all.