How to jet an aftermarket cam, #91 Webcam Options

[Kansas 914]

The symptoms (with 2 different sets of carbs Webers and EMPI same jettings) were the same. It will sit and idle at 1000 RPM with no problem (after a warm up) but is boggy on the low end under load - really have to keep the revs up to pull away from a stop light. Slight throttle increase after rolling creates a studder. Stomp it (WOT) and it runs great - pulls strong. It is like the throttle is an on/off switch, all or nothing - not much in between!!

I think I am close with the jetting but still not quite right. I wonder what the timing should be on a 1.8 with carbs and the webcam? The car also has electronic ignition (Crane Fireball).

I read in depth the thread on jetting Zach's 2056 with 44 Webers. I also read a good bit on Harney's Carb Clinic (great read - printed it for reference). Using the formulas in the Harney Guide I am close based on the 28mm venturis.

Idle jets should be 1.6 X 28mm = 44.8 (mine are 50)
Main jets should be 4.1 X 28mm = 114.8 (mine are 115)

I have 1.8L with a #91 Webcam (hydraulic cam & lifters) and Dual 40MM Webers.

Here is my current Weber jetting:
Vents = 28mm
Emulsions = F11
Idles = 50
Mains = 115
Air Correction = 200

Here are the cam specs:
LIFT = .430
DURATION = 265
DURATION @ .050 Degrees = 234
DESCRIPTION = Hydraulic grind for high performance street engines. Not recommended for engines with fuel-injection.

TIMING CARD:



As always your thoughts are appreciated.