Hey you could ask repco for a old Holden 186 motor from an XU1...
We just got my mates car on the dyno at redcliffe.... 186 Holden motor stock had done 280,000kms... Put an old Rb25 turbo on it with shaft play and all (was only gonna use it for making the exhaust and piping then replace when it was ready, but we couldnt wait) He produced 232rwkw at 14psi.... I was blown away and it sounded so good...