Well I'd like to say its better news -
Just to recap, here's how the carb behaved on the DP intake before the swap -
Mixture screws 4 turns out
AF - idle was 12.2, Cruise was 14.5 and WOT was 12.5
Vac was 13
Jets were .101 / .138
I had it running pretty darn good.
On Sunday after the swap - I had
Mixture screws all the way out
13- 16 AFs bouncing around like crazy at idle
Off the scale lean at cruise
Vac bouncing between 9-13 and dropping to zero on deceleration.
I swapped on a buddies AVS 650 and all the bad symptoms went away!
- it idled at 12.5 and I had steady Vac at 15.
This told me it was def a carb issue - not an intake leak.
- so here's how I spent my Tuesday evening -
Testing of TQ, Replaced the carb flange gasket - improved slightly but still a vacuum variation and running pretty ordinary (Sorry its bad news Dave) - AF was between 13 and 14.5 at idle
Took the holes in the butterflies out to .094th - slightly more even idle but a still way lean and a big Vac drop after blipping the throttle.
Blocked off the air bleeds completely, and the idle settled - it stayed around 12-13 AF and the Vac settled at 14.
So.......I thought I had it licked
- till I went for a drive , and -
AF dropped to zero when i let off the pedal
AF went to 9s under light acceleration and I blew black smoke.
Conclusions
- Blocking the air bleeds richened the mixture so it idled better
- but the low speed circuit needs the air from the bleeds to maintain a decent cruise/light accelration mixture
In which case - blocking the bleeds is not going to work. 
Next step Would I be right in thinking its not getting enough fuel through the idle circuit?
Is this common?
In which case, how do I fix it?
.
need to go back to the small jets and get those.107 out, also drop the tree to 1 or two turns, you may have knocked a float or something out of wack when you installed the .107's in.