RE: 460 swap mounts
You could try making a set by using parts of both mounts (assuming you have any fancy of machining parts). But even so - keep in mind you will need to change things in the front end a little bit (like springs) to make the steering and alignment corrected to the increased weight (should there be any). Also - make sure your type frame can handle the increased torque output without incident or need for modification. Plus putting a big block where a small block was requires a check of firewall clearance if you're switching from a C-4 to C-6 transmission. This will tell you if you need to make the transmission and engine mounts to fit it. Many times a standard transmission will fit in easier than an automatic as far as firewall (but then there's the clutch pedal issue in a changeover). If you have time an easy way to check for specialty mounts you would need is to go on a search engine and use broad, one or two word searches like specialty mounts or changeover mounts or Ford engine transplant , etc.