The greatest obstacle for me came at the very end when the finished car just threw everything it had at us to prevent us from getting it back on the road. That was some of the most frustrating stuff I've ever come across! You'll see what I mean at the end it's too much to get into now.
That said, the engine and building the car wasn't actually that bad it's just when 2, 3, 4, 5, 6 issues occur back to back that makes you wonder 'what am I doing here?'.
As for your E34, that car needs a V8 if you ask me - irrespective of Euro or American firing order. I once had the pleasure of riding in an Alpina B11 4.0 that was an E34 that they equipped with a 4.0L V8, slightly tuned to 320hp and an auto tranny. That car was a riot I tell ya. I couldn't stop grinning and the exhaust made the earth shatter. So I'm all for your plans! Please, please share it as you go along!
Thanks for your comment.