vacuum advance with soleniod?

I have this vacuum advance unit off my distributer but I don`t think it`s correct for my 70 383 rr.It is a large unit with a solenoid part # 3438262,what is the application and which unit do I need?

Its corect for a 70. Its a high speed retard if I remember rite. My 70 hard top had one, my convert does not. But the convert has electronic on it when I got it.

Someone on Moparts also said the FSM says it`s correct but every one I can`t seem to find any cars with them still intact on them.Is it common to replace them with a non-solenoid type?

might try here

http://www.autohobbydigest.com/numbers.php

Still trying to figure this out,someone sais it was part of the CAS emiisions package. :help:

There's one for a '71 383 on eBay right now. Item #260319795480

I remember seeing that setup installed on cars that I used to come across back in the 80's. Yes, 1970-1971; emissions related and probably CA; used in conjunction with the carb idle stop screw. It retards the timing at idle. The idle stop screw in the carb was insulated in a plastic bushing and had a wire coming off the screw head, so when the throttle lever touches the stop screw it makes contact thus completing the ground and powers up the solenoid. I don't recall seeing this used with the AVS but definitely on the Holley 4 BBL. I'm sure the 2 BBL had it also.