Mark, thanks for clearing the confusion with this annular 850 and the many questions I have asked > and you have been more than gracious to answer
*I located the secondary adjustment screw however, I may not need to touch it.
*I now understand the "squaring of the T-slots"
*"spacers" I understand the bandaid comment > my way of thinking > being I'm using a dual plane intake for lower RPM throttle response and drive-ability 'maybe' a spacer will trick my Wieand Stealth to act more like a Team-G and add a little more RPM to WOT...no?
*or, would a Edelbrock Victor be a better direction?
Update from Thursday...
*the 1600 rpm miss is history as I simply turned out the idle mixture screws as you suggested.
*while out on the water, I rotated/advanced the distributor about the size of a pencil line.
*the results from the above were >>> I was able to back down idle RPM thus close the butterflies even more.
*the engine picked up 200 RPM up top > I'll need to put a dial-back light on it to see where total timing's at. It was 35* total, all in @ 3000 rpm.
*even with increases jetting > the plugs appear very white and again, not seeing any fuel ring way down low in the plug > I may cut one open to have a better look.
*I'll email you a few pics of the primary M-block and corresponding carb body surface.
*** I feel it's coming together quite well in small steps (like you said)...I would like to set total timing for the max RPM but > be cautious to make sure I'm not on the cusp of detonation.