Looking for info on mounting a 292 into a 55-59 chevy truck. Is there a source for engine mounts or will I have to fab something? Any insight will be appreciated.

You should be able to use a '57 V-8 bellhousing at the rear. Contact Tom Langdon for front mounts.
Will Willis

I'll second that.

The 54 and up side mount bell housing is what you need.

Tom Lowe also has a few options for a 292 mount. You would need a transmission with a tailshaft mount though.

http://www.12bolt.com/250292_products/inline_engine_accessories.