If they are 289-302, they should... However, I have never done it myself. The engine mounts won't swap though. You have to get some at the local parts house for a Mav. They run 10-15 bux around here. Good luck Dave
Do a search... I posted pics side by side a while back. Dave Edit: I have an eBay pic with "Maverick Connection" in it. The pic is of Mav stands and is in no way an endorsement of this business. And I mean it! The stands are functionally the same, just the earlier stands are in 2 pieces. They were used 65-70 in several FoMoCo models. The Mav parts are one piece and used from about 71-77. Stands swap, mounts don't.
would this fit? http://cgi.ebay.com/ebaymotors/65-70-Ford-Mustang-Shelby-Cougar-Motor-Mount-Brackets_W0QQitemZ8028981529QQcategoryZ50454QQssPageNameZWDVWQQrdZ1QQcmdZViewItem http://cgi.ebay.com/ebaymotors/70-71-72-73-Maverick-Grabber-Comet-GT-V8-Motor-Mounts_W0QQitemZ4603169751QQcategoryZ34202QQssPageNameZWDVWQQrdZ1QQcmdZViewItem or these