Carb help needed

[niles]

Thanks guys for all the help. Here's the results of two days and six carb tear downs/reasseblies, etc.

between 6-7 in vac at 1000 rpm; it goes up to 8-9 at 1200.

idle screws responsive; starts killing eng at about 1 turn; max vac is at about 2 turns out.

secondary blutterflies were almost fully closed. primaries were open mid-way up the slot to get 1000 rpm idle.

the third Holley tech suggested the following systematic approach that I worked today. If you have black fuzzy rich plugs with a new carb; something is wrong and extra fuel is leaking into the engine where it's not suppost to. He suggested to warm up and take off the prim. block. The cavity behind the block where the big end of the PV is should be DRY. That a vaccum cavity. If it wet you have a crack in block, bad gasket or bad PV. I check it was wet, gaskets looked good, changed to a second PV. Went from fuzzy black rich to white lean. Looks like the new 4.5 PV was defective.

want to still explore the vac leak area because still running very rough from 1000 to 2000.
What is the best way to determine in you have any leaks around the intake manifold?

Comments/ ideas appreciated

gn