Will early 240z doors accept 280z window crank mechanism and windows? i have 2 sets of windows from a 280z and want to replace the better mech. into the 240z. I've read a few threads about the glass not being able to interchange with the 240z mechanism but if i swap all the compenents i would assume it should work fine if it bolts in.

The window regulators are different between the two models. I also seem to remember that there's some difference in the length and/or position of a channel that the rollers of the regulator sit in. I made an early regulator work in my 260Z drivers door but it required some sheet metal modification and a change of channel (else the roller would fall out of the channel on one extreme of the up/down movement). That was years ago and I don't exactly remember all that I had to do. Eventually I went back to actual 260/280 window and regulator hardware - just know there is a difference between the 240 and the 260/280 when it comes to window and door hardware...