Hi there Nick,,,,,,,I am a "newbie" to this stuff, and I just found this page a couple days ago. I had been thinking about trying this swap a couple years ago, but wasn't sure if the darn thing would fit in there! I am a subscriber to Auto Restorer magazine, and I wrote a letter to them seeking advice on this 300 swap. They said that they were told, and were sure that it could be done, but they didn't have any experience with this swap. In the letter, I'd asked them about motor mounts and they referred me to Clifford Performance, and said that they "made" motor mounts for this purpose. Soooooo,,,,,,,,,,,,I contacted Clifford Performance and asked them about it. They also assured me that this swap could be done and have the clearances needed to keep everything stock looking but said "they didn't make motor mounts for this purpose, but used "big block Ford" mounts instead. They said you mounted the mount on one side as it was supposed to be mounted, then turned the mount "upside down" when installing the mount on the other side. Sounded fairly easy to me, just a bolt-on. Now, since I was assured that I could put this 300 six into my 1965 Mustang, I started looking for a motor. I have since purchased a motor and wanted to "just set the motor into the motor compartment" as it is, to MAKE SURE that it would actually work, before starting the build on the motor. Once again I called Clifford Performance, this time to get information on "the actual Ford big block motor mounts" they use for this purpose (year, make, model, and engine size of the car for which to buy the mounts) since "big block" motor mounts come in various sizes and configurations. The only answer I could get was to "just buy Ford big block motor mounts" which left me in "limbo" again. Have you ever heard of a big block ford motor mount that would work for this purpose? If there is a mount that would "at least" practically bolt in,,,,,,,,,,I would rather "buy" this mount to start with if it means less modifications have to be made to it. If you don't have any idea of what I am talking about when I asked this question, I would appreciate it very much if you would tell me the type of Mustang V/8 motor mount that you started with on THIS project that you completed. If I got just "any" V/8 motor mount, would the modifications be the same? I'm afraid that if I get one that doesn't quite look the same as yours,,,,,,,,,,,,,that I'll end up "screwing it up"! Thanks for any help you can give,,,,,,,,,,,,,,,I think I need one of those "yellow books", that says "For Dummies" on the front of it!