If you decide to do it your self, yep it can be done.
Lots of examples out there.
Quick way is get the turbo and exhaust from e23 745i.
Head is different since the studs are longer and bigger.
Here is a Metric Mechanic prepared head.
One issue is the R/F mount needs replaced. You will need 3/4 inch more space.
Send me an e-mail if you need a R/F mount.