retard timing mechanically?

The only thing I can't build are parts that need welded. I can piece stuff together as long as it don't need welded.
But the big "$0" sparked my interest so all you do is run it to the manifold? I understand there isn't any vacuum in the intake at wot, so that keeps timing retarded enuff?
What is a good base timing?
Yes, as long as there is vacuum in the intake manifold it will pull on the vac advance and keep the timing up for no boost cruise. At WOT the advance will fall off and you would be starting to make boost anyway.. Just think about it..