Rough Idle Problem- 1967 Valiant

Perhaps your new e-distributor is from Ningbo of China since they have long made one for the Chrysler V-8's. Those have an HEI ignition module on the side of the distributor (your's too?), thus termed "ready-to-run" meaning just needs IGN power. I have one on my 1965 273 engine. I recall some people found what ignition module they use. It is 4-terminal, like the original GM HEI module, but different dimensions. I recall for a Japanese car. I should research to buy a spare, though I'm thinking of using a GM 8-pin HEI module (1985-95) like on my other 2 old Mopars, especially if I change to an EFI system which can command spark timing (ex. Holley Commander 950 on my 1965 Chrysler). You can also now find some Chinese carburetors for classic cars, like the common Carter BBD, though I haven't seen a BBS yet. Many rant against Chinese-anything, often with reason, but the Ningbo products seem well-built.