Linkage comments / question

[Buzzmobile]

Well, I have been working though a acceleration hesitation and I think I am on to something. I have a 2X4 tunnel port set up on a 427 SO. Since getting it back from the builder, it has stumbled at low RPM response and steady driving speed (this little stutter). Well I increased the mixture to run richer to get more gas to the thing below 3000 RMP and that helped, but man...red lights were hell to sit through and just to rich. When I got it to do well moving, idle at a stop light was horrible. Then, I started thinking about the linkage. It is on a progressive linkage, new from the builder, so I thought I would go look at it. It seems like a LOT of travel before the second carb comes in. So until I romp on it, I was running on 2 barrels for a 580HP motor. So, I took the linkage and put a bolt in it to take out the slack of the progression and man did that car wake up. No hesitation. Runs much better. Now a couple of questions. I have to redo the idle mixture on the 2x4. On the idle mixture screws (4 of them on 2 Holleys), what is a good starting point when adjusting them. I have heard all the way in and then out 1.5 turns. Is that correct? Also, do they make different sized link arms to change the actuation of the progression? Is there a kit that I can get to fine tune the progression. I know there is some adjustment on the arm itself, but it is still out of range with it all the way set to the end. Thanks

Buzz