by gt350fme » Sun Apr 03, 2022 2:24 am
Do you have the manifold part # couldn’t find it for DCOE 45 sidedraft carb?
A undrilled vacuum port would be a raised thickened area intended for installing your own vacuum nipple as needed, also could be a mounting point much like in my pic of the # 1 cyl manifold runner there is a round raised knob that would need to be drilled tapped for a nipple or bolt for hardware mounting, not sure what mine was meant for but it’s there probably a mounting point, for vacuum I would think somewhere just past the carb butterfly’s and centered to pull vacuum from all runners evenly, if it is not there perhaps pierce manifold tech line could help?
As far as carb tuneing make sure you have good fuel flow and pressure, and correct float level or it will never work well at all.
As for what jets, emulsion tubes and air bleeds you need has to be worked out by much trial and error, a real pain, OR take it to a performance tuner with a Dyno and be done with it, not cheep, perhaps $750? But done.
For what jets mine ended up with?, I actually still have the carb and manifold and will have a look soon but may not be exactly where yours is at, I had a similar build as yours with a next up performance cam
1964 Chevy panel K30
1973 GT Vega Hatchback
1977 Chevy K20
1984 944 porsche
1992 Lexus SC 400