The Jalopy Journal
https://www.carburetor-blog.com/knowledge-base/carter-afb-carburetor-identification/
https://www.motortrend.com/how-to/1611-rebuilding-the-carter-afb-carburetor/
So if I find that stamp how can I decide it ?
There is also a port in the back plugged off for brake booster.
I think mine has port for pcv & vacuum advance port plus a full time vacuum port.
You don't want constant vacuum for the distributor. Your advance would be constantly working. The more you crack the throttle the more vacuum it...
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The Jalopy Journal