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I have been kicking around the ultimate A engine. A Burtz with EFI and a Turbo. I've already got the Burtz approved by the wife since it's "necessary" for the AC she wants. I figured the Turbo would be easier to package without any drive problems.
As far as the small engine turbo considered above you need to remember the A has 200 cubic inches and less than 1/2 the compression of a current engine. Most of those turbos were designed for 1.6-2.0 (up to 122") and 9+ compression. I'm thinking one sized for 289"-350" will be ample. Also Valve seals are designed to keep excessive oil from getting into the guides. If you are getting enough air past the guides to pressurize the crankcase you need new guides.