I think it is easier to jet the carb w/a Offy intake.
A few guys here has simular problems running a Clifford intake until they put heat to the manifold .
What jets are in the primarys now?
What are the metering rod numbers?
Try going two steps leaner on the primary jets to see if it runs better/leaner.
You are not going to hurt it if its too lean.
Unless you just have it wide open for a long period of time.
Even then ,it probably won't be too lean because your secondary jets are probably too rich also?
Go & put some leaner jets in the primary side.
Put the car in park ,bring the RPM's up to say 3000 & see if it surges up & down in RPM,or it feels hesitant to go higher.
If it does surge ,you are probably too lean.
Go back one step richer in jets (higher number)try it again.
Every engine runs different so it is hard just to tell someone these jets are perfect, run these.
The metering rods should have three steps in them.
Skinnyist, is your wide open throttle. middle is your mid throttle position,fattest is your idle.
You can measure these rods w/a mic, or a dial caliper.
So if you want to run leaner @ idle (the fattest part ,try & get a rod a little fatter ,a few .002-.005 range .
Metering rods are going to be more $$ but it is easier to take out & put back in.
