Tad,
What is the height of the mast hoist? I know when I bought my 6.0 it came with an E/P spin that was said to be the 'original 6.0 class spin' (1994 era) that never took off in popularity. i got into the class about the same time the NE class spin was introduced and bought one of the frist of this generation and never went back. After sailing the two sails it was a totally diferent ball game.
The hoist height question is because the spin hoist tang installed originally was a foot lower than the one that Smyth designed the NE class spin to. I think your boat is from the same era as mine was, and therefore am wondering if you will need to raise your hoist another foot for at least the new sail if not this one too.
One note, most of the guys here in New England have switched to a bail and cheek block system similar to the I20 to equilize loads during full rotation. If you are switching the height of your hoist, I would suggest looking into this.
Hope this helps (Sorry, i can't remember the specs on the hoist heights off the top of my head and I no longer have the boat to measure.)
Chris
www.acceleratedchaos.com