I was considering doing the same on my '68, but thought I would look for some advice on the subject.
Ran into a few discussion threads over on Team Camaro that had a few guys saying not to change. They felt their manuals worked faster than the power tops & had much less problems. That weekend I cleaned & lub'd up all the joints & hinges in mine, and they were right. Now mine goes up & down with hardly any effort and I know I won't have anything happen, like getting stuck half way.
I'm happy with the way it is now, and I'm putting the money & time into other things I want to do on it.
