Kevin-
I picked up a 7:1 Carbo Ratchamatic system last year (becket hangs from a triple top) and can give an unqualified 10 out of 10. The part number at the time for the bottom was "HSB360"(Harken Small Block 360), I'm not sure what the item number is now. The 8:1 system is just not necessary as I sail a TheMightyHobie18(sometimes as a Magnum.) The adjustment factor is easy and can be accomplished in a short amount of time. Several sailors in my Fleet have commented on how the line run "smooth" through the blocks. I have pics of the set up should you want more. Just email me.
Best Regards,
Troy Szabo

PS - Mid Winters West, yahoo!