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"M-1 dual plane with an adapter for the Thermoquad" ...the adapter in-between could be giving you a problem too. What is the TQ number on the baseplate?

Rather than go through a manifold change redo the 600 and your driveability should improve. A stock cam 340 would do well with a vac 600....Who does it would depend on where you live. I don't know of any mailorder Holly rebuilders here in GA. >>Note. i am not familiar with the flange...

no retune should be needed. just make sure the throttle return works. you don't want to mash it all the way and the linkage sticks.. .....try it with a friend and engine off..

"but I wont beable to get the bolts in one side. " and don't forget there is a torque sequence...do not put all in on one side.. you MUST start in the middle and go across from side to side out to the ends