Rebuild or Replace 850 TQ for a Mild 340?

Rebuild the one you have or



If you're wanting smooth running and any help with gas mileage, get a TQ

that has ported vacuum for the distributor
IIRC, lean burn and others do not have ported vacuum.
To install one is not the big of a deal

Be sure to make sure the throttle shaft bushings are tight, TQ's
Are known to wear the out prematurely