I don't have an answer for you regarding your 'squeal', but you've pique'd my curiosity about your VW Camper Vanagon w/ the SVX engine, considering I owned a early 80's Vanagon Camper. I had heard of some other engine conversions on these using Subaru engines, but your's is extreme!

I'd like to see some pic's if you've posted any of your installation. Is this the VW 'Synchro' (AWD) version by chance?

It was always a nice handling rig (for what it was), but you've certainly resolved the 'under-powered' problem quite handily.

-Mark