I don't expect you'd take the word of a flatlander but,
Here goes; I use 44 mm roundslides with 340's, high comp heads on ported cylinders and case, Jaws D-pipes wrapped and choked by 1mm. 2 deg advance timing. This is at 8 to 10,000'. I use 67 grams with the titanium spring and a sno-pro green secondary and a 53 deg. helix. 20x43 gears.
It's bored to 975cc but the clutching should be close. If not as much power go with 62 or 64 grams in the primary. You might try 360 jets first. I don't use any 110 fuel at high alt.
Owen
ps. with the 40's turn the air screw out to two turns, after two it doesn't get any leaner.