Welcome to CHR Bart, sounds like a nice fleet you have. Post some pics in your gallery when you have a chance. If you do a google search for conversion parts for the '55 you should be able to come up with something. There's a bunch of chebbie guys on here, someone who has done it would probably be able to tell you everything you need. I've seen tri-fives with side motor mounts instead of the front and bellhousing mounts, not sure who makes them, maybe Art Morrison??? Have fun with the build, and keep us updated on the progress.