Dude, that's a rare one seen around here- has thermal reactor style '75-77 HBs and the air pump bracket bosses on the cam cover and the air pump pulley too
Do a search on what you're looking for--it's a topic that has been discussed for years- now in the archives. Classifieds has lots of dealios on engine mounts, engine sheet metal (DIY too), exhausts, etc.
peace/ Marty