I just put a Holly double pumper 800 on my 68 GTO that has a 3/4 cam, roller rockers, electronic ignition, stick shift, 400 engine, and live at 4000 feet altitude. I need a starting place for jetting on the carb. Any help will be helpful.

I just put a Holly double pumper 800 on my 68 GTO that has a 3/4 cam, roller rockers, electronic ignition, stick shift, 400 engine, and live at 4000 feet altitude. I need a starting place for jetting on the carb. Any help will be helpful.
:biggrin: I have a 625 road demon double pumper on my 400 and my prims are 68 and my sec 76 and Im also at 4000ft and my spark plugs look perfect.