Another carb help...

[tim_mc]

The can that came with my aftermarket GM HEI was pulling too much vacuum (20 degrees at 7.5" Hg per the spec) putting the total timing around 48 or so and causing some surging at highway cruising, so I needed something a bit more mild. I'm currently using a Standard Motor VC204 with 10-12 max advance, starts at 7-9 Hg, which is a match for an AR12/VC1838 for 1975 350 Buick per the attached article. Works well with my setup, which is around 42 degrees total timing (12 initial+16 mechanical@2300rpm+14 vacuum), manifold vacuum source (not ported/timed). Edit: I see others have already posted Lars' article!