Originally Posted by Arns85GT
I tried Joe Padavano for a PM and no luck
I never got the PM. I don't know Caddy motors, but I've never heard of an Olds distributor fitting a Caddy. The only exception is the 76-79 Sevilles and 79 Eldo that used the 350 Olds motor (so obviously an Olds distributor fits those). The Olds uses a hex oil pump drive - all other GM distributors I've seen use a flat blade drive in the distributor gear.
More importantly, the top photo is a Caddy 4.1 distributor, the bottom is an Olds (all 1964-1990 Olds V8s use the same distributor). Do the look like they interchange?