Headers VS Manifolds

REMINDER- because some folks do not grab the thread from the start and miss some of the detail.
The application is 1966 Barracuda ( EARLY A Body)( first generation)
The K Frame is a /6 using schumaker motor mounts
the trans is a 727
Modifications: the trans mount was cut down to get the shaft geometry close to spec

How about installing a proper trans mount and shimming the rear to get pinion angle back to spec? Seems easier this way than any other option.

Or is this not possible due to the size of the 727?