If you do turbo try to get a turbo of an JDM Subaru Liberty 2.0L wagon (E82T motor) - sorry I dont know the specific turbo model number but this turbo will push 22psi into a 2.0L motor (so mathematically that will work out to 36psi into a 1.2L - about the same flow). Not that any one would want to put 36psi into a A12 (could try though lol).

However I'm running 20psi and the turbo will hit that at 2500 - 2800 rpm and will hold that all the way to 7000rpm (doesnt drop of like too small turbos do).

If you do turbo, an A12 with 20psi, 30 Degrees timing in a B310 will leave you with a better power to weight ratio than a brand new V6 SIDI Commodore, so In a 1200 ute u might also have commie V8's and Ford turbos!

EDIT: I crunched some numbers and a 1200 Ute with and A15 could beat a XR6 turbo/Commie V8 if you turboed it with 20psi (and 30 degrees timing). Well, you could beat them if you can stop the wheels from spinning! My poor B310 will smoke them in 1st (possibly second with a non slipping clutch) when trying to accelerate even if Im already rolling along at 20 km/h.