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I'd look at the synch separator/AGC stage (usually one tube sharing a cathode and a grid or two in Zeniths). No RF/sound and sync issues (presumably found by video injection, right?) sounds like a problem associated with that stage.
This is a really wild guess, but if you connected the tuner wires wrong perhaps you shorted the tuner AGC line and the issue fed back to something affecting both functions of the tube.
Horizontal roll (I assume you can get a slow roll in either direction, but it does not hold lock) could also be a bad H AFC diode package.
Did you try to connect the remote hardware when you did the chassis swap? Most non-remote sets lacked important aspects of the remote wiring and trying to adapt them to support that requires care and double checking of connections.
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