Vintage Air sells a fairly complete kit that fits under the dash. It is designed for v8's, but some here have put them in with Stovebolts. They may have some good feedback. I can't remember which issue or mag, but either "Custom Classic Trucks" or Classic Truck Magazine" had an install article last year. Search their web pages.

Current fleet (subject to change w/o notice)
\'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 2011 Dodge Avenger, 2015 Jeep Cherokee. No, they don't all run.
My other ride is a (B737)no, (B767)no, A320.... Update... was Embraer E190, now Boeing B787.

Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.