Welcome!
There is a real helpful thread (long) on the 67-72 Forum, which describes replacement of the trans and engine mounts. I believe he uses Anchor 2337 mounts for the engine and the Anchor 2107 and 2108 for the trans. Not sure these will work for your application. I also will be replacing these soon on my project. I refer to this thread often!!! Good luck! We would love for you to share your build with pics!! See post #s 55 and 56.
http://67-72chevytrucks.com/vboard/s...=575596&page=3