another weber jetting question
 

I am in the process of putting my carbs back on the car after a carb rebuild. I am not sure I have proper jetting yet. The car currently has

1974 2.7L S
CIS "S" heads
Euro RS P&C
GE 40 cams
40MM Webers
RS curved dist
MSD 6AL
Bosch WR5DS
Tall PMO manifolds
carb jetting:
36MM venturi
tall AV
F3 tubes
155 mains
180 airs
60 idles

Some of the references I have recently seen suggest that this setup should have 175 Airs instead of the 180s. Otherwise it matches.
My reason for questioning the setup after seeing the 175 reference is I find VERY little effect when I adjust the idle mixture screws. It makes it nearly impossible to tell when the engine starts to miss. I can never be confident I have them adjusted correctly. I haven't been able to drive the car yet. I hope to tomorrow. I just wanted to start with the best starting point before I start chasing my tail.

I also have available
F24 tubes
65 idles, 45 idles
170 airs
150 mains

Your help is always appreciated.

Rob,

Your current jetting is VERY close.

If the idle mixture screw adjustments do not make any difference, make sure that the idle bypass scews are properly adjusted. You might also try 55 idles, too.

I'm assuming that fuel pressure and float levels are absolutely perfect. :) :)

Steve, as always thanks for your help and insights.

I do believe the floats and fuel pressure are spot on. I have learned from you to make extra sure they are set correctly. I spent quite a longtime getting the floats all set the same. I will try to reset the air by passes tomorrow. One of the things I might have done wrong with them is to set all six of them to the same level as the lowest draw. Something I read suggested that you set each side to the lowest denominator on that side then re-balance the sides with the idle stops. Is that a better way?