carb suggestion for Cadillac 425 and 500

[caddylackn]

I would like to rebuild one carb to use on either my Cadillac 425 ci. or Cad 500 ci. motor.  I will run either engine in my '69 Chev. Truck Camper Special and occasionally have a cab over camper with a total 7,500 GVW.  Stock or mild cam, pocket ported heads, HEI, MSD 6A box, and headers.

I have a 17057530- from the CAD 425, number shows it is a Calif. model, electric choke
a 7043230 from the Cad 500- pretty dirty shape, divorced choke
a 17058204 currently in the truck atop a 350, electric choke

Which would be the best carb to rebuild?
Can I run the 425 carb on the 500 by just swapping in the 500 carb jets, secondary rods?
I am not required to run EGR in the '69 truck and wasn't planning on it.  Both Cad motors had EGR manifolds. Will I need jetting changes?

TIA

[caddylackn]

I ordered the SR kit for the 17057530, hope this works.

[Cliff Ruggles]

Yes, the 17057530 would be the best carb to use.

No need to re-jet when swapping it back and forth.  Make sure to provide access to the APT screw.  I would tap the airhorn and install a 3/8-16 set-screw so you can remove it for fine tuning if/as needed......Cliff

[caddylackn]

I bought your book, I will do your suggestions.

Thanks for your help.

C-