Gosh, it's nice W, but it looks complicated!
I agree with Alf. You will probably have probs with fuel.
Is there a reason why you can't roll the engine backwards for a better carb angle, then bend the exhaust pipe to where it should be? I filed my motor mounts for a better fit with the carb setting level. I suppose you could also cut and re-weld the manifold.
You can fiddle with the float level, but it will never be right, at that angle.
Front fender REALLY needs better support. Read the threads on that...
Good luck
rc