[zrayr]

have you called Jim with your concerns ? He will be able give a greater detailed response than you will get from the forum.

I wouldn't be concerned that your gas milage has dropped in comparison with the Holley carb. And 3 mpg is nothing to worry about. Actually I'm surprised it's not considerably less than that. You are getting a lot more air into the engine with the Weber set up, so it's normal for the gas consumption to increase.

Ditch the fouled plugs and start with all the mixture screws out 3/4 turn. turn each one in until the rpm begins to drop, then it back out slightly. None of them should out more than 1.125 turns, If they vary from each other slightly don't sweat it.

I'd do a plug check after a full throttle run before considering a jet change. And consult Jim before any jet changes. You paid a premium price for his system because that includes his technical assistance. Use it.

Z.