Originally Posted by Mullins61

One pipe is connected to rear of Distributor vacuum, the other is capped with tape. Can these be disconnected if no emissions controls?

Originally Posted by Frank Reiner

Herewith a suggestion that may help in determining if the stumble is timing caused or carburation caused.
Re-assemble the distributor, assuring that the centrifugal advance mechanism is working freely, and that the point gap is correct.
Install the distributor, leaving both vacuum hoses disconnected.
Set the timing to yield 33-35* BTDC @ 3500RPM.
Drive the car without vacuum to the distributor.
If the stumble persists look to carburation, or, as a rather lower probably, a very weak coil and/or ignition amplifier (switchgear).

Originally Posted by cth350

> Install the distributor, leaving both vacuum hoses disconnected.
Leaving them disconnected, but plugged.