When I had my 65 Dart with power top on the road, the power top work flawlessly every time up or down. Later on I bought a 65 Signet 'vert with a non-working power top and I was able to raise/lower it by hand, well two hands and a little extra effort.
I think part of the top mechanism where the lifts attach is constructed differently than on a non-PT, which is spring assisted to raise/lower it. IMHO, I believe it would be easier to replace the top bows with the correct ones for a PT.
FWIW, I'm parting out/getting ready to cut up my 65 'vert to concentrate on my 65 wagon (too many projects and too much rusty quarters on the 'vert. So the complete PT set-up is available: top bows, lifts, motor, wiring, floor hardware, etc. IU see you in the Bethsda area which is about an hour or so from me should you be interested in the set-up.
