i no its been done before but wondering if anyones done or doin a conversion at min.
my bro has a 200sx which is boarderline 300bhp n its fast n puts up with abuse n never misses a beat! (2.0 turbo).... if u want u can buy the whole conversion on the floor with all running gear plus loom n ecu etc for around £1000! YB on the otherhand would be more than double that for complete ready to bolt in conversion. replacement engine for my bros is bout £400 but ud prob only get a YB head for that kinda money

basically a bit of head scratching n welding u could mount jap power in a mk1/2 etc then if u brake anythin it wont be overly expensive to fix... massive market for performance mods to!
id like to see some if anyones doin such a project!!