Hi Tommy,

I wish I could say there was something scientific about my selection, but in fact, it's just the TB that I got with the wrapover manifold from Atkins.  Considering how poorly the manifold was matched, I can't say I have any real confidence that the TB was a good choice either.  

Since Ed was having good results with his 1.75" OD (about 42mm ID) intake runners, I decided to use those also, along with the 42 mm TB.  This worked very well on the B drive, and smaller prop, but I just don't know if it's working well on the C drive and monster prop yet.  The real test will be trying to get the cruise rpms up to the 7000 range.  That's where the restriction would really become a problem.

Rusty (just don't know yet)