putting a vacuum advance distributor on a 4.9 Caddy v8
I am doing a build with a Caddy 4.9
This will be a carb'd engine and I will be using a distributor from the older 4.5 version of the engine and no ECM.
I am told I need to use this distributor with the internal mechanism from an older engine to get a free standing weights/vacuum advance. It may be the 4.1 distributor from 1983, but I am not sure and I am looking for advice before I buy.
Does anybody know which older distributor is the proper donor for this modification?
and BTW, I don't want EFI on this one