The 4BTSwap site is definitely the place to go. I'm installing a 4BTAA into my '46 Chevy school bus and it has been a terrific resource.
You'll be amazed at what you can do with that little motor. I'm building mine out as a high reliability, long range, high mpg cruiser. 130hp/335#'s of torque mated to an Allison six-speed auto with a "target" of something near 30mpg. Others have pumped that same little four banger up to over 800HP so it has an incredible range of potential. Just do some homework, decide what you want from it and build it out to what you need. The older, all mechanical (no computers)engines are getting a little harder to find these days, but are much easier to build out & maintain.
Like I said, dig in, read up and I think you'll find out pretty quickly if it fits your plans. Best of luck and keep us posted.
