cstav86
SILVER Star
I have a similar experience. I hook up a vacuum gauge and set timing that way. I don’t know how advanced it is, but it’s well beyond the 7° and it’s a happy motor there. When I can see the BB in the window it runs rough.For what it’s worth: On our 1970 with the original F engine, I’ve tried setting the timing at 7 degrees advance and it runs like crap. At about 28 degrees advance I get about 22 vacuum and a nice idle at 650.