Weber 48IDA Basic Education & Help Needed!

[Gaz64]

Your idle jet 65 and holder orifice 100 (idle air jet) are what you tune for light throttle economy.
Your choice depends on where your mixture screws are now. 3/4 turn out is a good starting point.
Try a 60 with the same 100 first. If you need more than 1.25 turns out, then stay with 65, and step the air up to 110, then 120 if necessary.
You should use a wideband 02 sensor and data logger if you are able to.
Your cam is a nice mild lopey grind for a street car.
I think the engine could go better up the top end with a 38 venturi, possibly even up to 40mm.