Wow, old thread alive again.
joewell80
I don't want to start the old ported vs. full manifold arguement but for educational purposes you may want to read the link below. I would personally never run a non emmissions controlled engine on ported vacuum advance. The first section is about camshaft timing and is of noconcern to you, breeze through it and you will get to the part about using a ported vs. fulll manifold for vacuum timing crankshaft advance.
http://www.jalopyjournal.com/forum/t...ot-time.54221/