Just to start off, thanks guys for answering the questions I've already asked. It's helped me move along my quest.
So now I'm dialing it in.
This is a new GM goodwrench crate motor on my 1981 c10 RWD.
Edelbrock dual plane intake (#3701) and mild cam.
Question is about the vacuum advance timing.
Per the internet, I unplugged and closed off every single vaccum line going to the carb. I then set initial timing (10 degrees), idle speed and mixture.
According to the emissions sticker above the radiator, the distributor vacuum is getting it's vacuum source from the manifold (through all the EFE TVS stuff) Well I deleted the EFE with my headers. So now picking a vaccum source is rather straight forward. A ported source on the carb, or the manifold.
Problem is, when I have everything dialed in, and then plug in the manifold source, it jumps my rpms by almost 400 (650 to 1050), which seems excessive to me. Is that normal? If that's the way it is, I wouldn't go back and reset my timing and idle after plugging in my vacuum advance would I?
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