I could tell you all the part numbers and where to get them, but I'm not familiar with big block timing characteristics to tell you how to set up the distributor unless I knew the timing totals and such needed.
With the plates from FBO the mechanical is changeable as is obviously the initial.
Vacuum advance needs to be set in a normal usage situation per engine, fuel, elevation and all that.
For small block it's usually like this.
All in mechanical timing by 2,500 RPM's with a single spring replacing the big one. (Mr. Gasket 925B curve spring set from Autozone, Jegs, and a few others.)
Mechanical total limiter plate J685S from FBO (
www.4secondsflat.com) dropped in at 18 degrees for an estimated 14-16 initial giving the engine 32-34 total mechanical.
Big block Adjustable vac advance almost anywhere, Autozone, O'Reilly's, Napa, and others
Hope this is what you were after.