So anyway I know engine swaps aren't easy and can be very costly and require custom fabrication for engine mounts, new headers/exhaust to fit the car and all that jazz but it still seems like an awesome idea!
My first thought was something small and responsive like an SR20DET (From the Silvia's) which would leave plenty of space and replace the other 4cyl already in the car. I googled it later that day and saw someone had already done it.. and was producing 530hp @ 26PSI!

I saw that there is still alot of room in the engine bay and the curiosity of a bigger engine got the better of me so my next idea and google search was an LS1 (Out of early model Corvettes in America or more commonly V8 holdens in Aus).
Turns out that this had been done too but was a bit tricker! A wider kit was needed with a stronger diff and the engine is a tight squeeze but having such a powerful motor in such a small car would definitely be interesting!
Another thought that popped into my head was the BMW S54 engine which is in the E36 M series aswell as a Z3 M coupe (but I want a convertible not a coupe

Anyway, these are just thoughts at this stage, I've been keeping an eye on the price of Z3's for sale in Aus and they seem to be anywhere from 12-30k at the moment, ideally I want a black exterior with red interior

I'm thinking that once I have my skyline paid off I might start saving up for a Z3 and do an engine swap - it'd be an awesome project to do DIY

Thoughts?