Wishin

Hey, can anyone recommend any good places to go to as far as front cuts, engines conversions etc go in Perth? I'm looking to buy a cheap N/A (auto, yuck!!) Cefiro but I need to make sure that I can get it converted to an RB20DET / RB25DET (!!) / SR20DET as required. Pricing for each of the front cuts obviously differs (from $1500 - $4000) but I just need to find out labour costs for the conversion and where I can go for expertise if I do some of it myself. Thanks!!