[Jeff Lee]

I don't know about consistancy being an issue with turbo 301's. Ask Rick Unterseh in D7 (member here) for his tally this season and last. Or Neil Smedly who won class, #1 qualifier and the event with his 301 turbo at a national event. Actually, if you think about it, a turbo car in altitude should be more consistent as the engine is not "struggling" to breath air from one pass to another.
And finding 301 turbo engines? Piece of cake. Most people couldn't throw them far enough!