Motor mounts may be simply collapsed from age and heat and oil. Replace them, they're cheap. Replace the trans tailshaft mount at the same time.
Read over the brake system specs, including line pressures at the bottom of the page, before deciding on your course of conversion. Make sure that the line sizes are the same at both outlets as your existing system, or you'll be buying or making lines that you will have to replace again, unless you can find adapters.
