I tried the FZ1 springs in the 2.5mm polished slides today, & I like that combo the best so far, as it does the least objectionable things wrong. I'm gonna run this for awhile & optimize for it. There's a quick lean spike transition at roll-on, more so in the lower gears, but no hesitation, & this combo is more stable at WOT.
I may also play around with FZ1 spring length, as the springs are relatively inexpensive. The again, maybe not.
The idle AFR is in the 11's, due to the reduced vacuum demand from the free-flowing Uni 4229 pods & the more aggressive 813 cams. This is a common CV carb issue, especially with performance cams. The fix is to drill a small air bleed hole in the throttle plate. Anyone here BTDT with these carbs? I'm thinking something in the 1mm - 1.6mm range. It's easy enough to start small & go bigger. Start too big, though & the plate is F'd. Any ideas?