Can anyone help decode Mopar distributor numbers?

Need some help.

My car (1968 340 auto) was updated with a Mopar electronic distributor by a previous owner. It has some worn parts (cracked wiring, missing shaft bushing,...) but had been running fine before I broke the bushing during an engine rebuild.

I have another I found for sale in like new condition that I am considering swapping in. I have searched around to try to find a decode source but not having any luck. Looks like people use old parts books to find the application for a given distributor number- I don't have access to them.

Can someone tell me what the application is listed as for a Mopar electronic distributor with part number 3656763 (73)? and also part number 3656587 (72)?

Thanks!
3656763 is 73 and 74 318-2 barrel. Automatic or manual transmission. ABC and E bodies.
3656587 is 72 318 2 barrel. Auto transmission. ABC and E bodies.