Hey Guys, New to the forum, Read it a while never posted, Got a few questions on a possible conversion I am going to do?

I have a 1.9 american tall bock engine cvh, Can I put my 1.6 rs turbo head on it? will it run? Does it get problems with high temperatures?
How much BHP am I likely to get from it?

Currently using a 1.6 rs turbo engine, Is it worth the upgrade? Already have the engine, thinking about doing the conversion.

Thanks for any answers!