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Lelo Dart, the FBO springs are absolutely the Mr Gasket 928G springs. About the manifold vacuum debate? I have found manifold vacuum for distributor advance usually works better for big-cam motors that require extra throttle opening for idle. The extra advance at idle helps to smooth out a...

Hope this might help - Just a FYI, the FBO springs are Mr. Gasket 928G (for chevy points distributors). That's why the springs are such a ***** to put on the posts in Mopar distributors.