FBO springs

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 big cam, and lets you close the throttle plates to the correct position on the idle fuel transition slot in the carb, and gives you more pump squirt (much better response!). Ported vacuum can be better for stock/near stock motors with high idle vacuum.