well heres my thoughts on the situation. i first off went turbo a12 in my 1200 sedan but for the price of a turbo rebuild an carbon seal i have basically completed my l20b conversion (turbo seals were gone). i picked up the car (series one bluey wagon) for fifty bux with slipping clutch and no rego. I did all the mounts etc myself using works welder so no cost there. new clutch, radiator recore and shortning, tailshaft and exhuast is all that i need to fork out for. i attacked this conversion differently than what ive read here as i wanted the engine to sit as low as possible to fit downdrough webber and hat for future turbo conversion (not for a while). to achieve this i modded the crosmember, cut 25mm out of the centre and rewelded it giving me extra sump clearance. aslo had to make spacers to drop swaybar down to clear oil pump. trans tunnel needed no mods just ground off old mounts, gearstick sits back approc 100mm. used bluey clutch slave and rad as well, cut complete rad support out for clearance, used l16 water pump and pulley to gain extra front clearance due to l20b having that hydrulic coupling. this setupwill provide plenty off fun with huge scope for further mods. i have also driven a a15 in rally car with twin carbys and monster cam etc and to be honest it felt slow (supposedly 55rwkw). tuorque is great thats why i went the extra capacity, just some food for thought.