Exchanging motor mount plates

Bought four motor mount plates from ebay and had them chromed with all the bolts, now I want to replace them with the ones on my bike. Can I do them two at a time? What would be the right sequence as far as top first or bottom first? Would I need to jack up my engine?
Any advice would be appreciated

I don't see why you couldn't do two at a time. I also don't feel like you should have to do them in any particular order. The remaining mounts will hold the motor up just fine. Personally I wouldn't worry about jacking up the engine if you were leaving most of the mounts in place and just replacing a set at a time. Unless you were unable to get the mount bolts through both sides. If you do decide to put a jack under the motor, do pad it with a board or something to prevent cracking the oil pan (It's aluminum.)

Nice looking LTD by the way.

Do the bottom one first then the front one and then the two rears (motor won't move when done like that).
If you release both the bottom and front at the same time the motor has a tendency to lean slightly sometimes requiring the use of a rag wrapped tyre lever (or similar) between the frame and cases to line the holes back up.