I think you will find there will not be much in it weight wise.

I was looking at these engines a while back. Can be picked up and shiped from the states for not a lot of gold. And if you pick the right donor they come with a Tremec 6 speed hanging off the back.

Read about a chap who put one in an E30 M3. Chucked the cats away and ran it with an emerald ECU and it was making a very undestressed 380 bhp.

You know you want to throw the YB away and put one in the 3dr!