Next build motor????

I am planning my next build. I saw yesterday that the 88-92 318 motors have roller cams. I am thinking that would be a good place for me to start with the motor for the next build but I have questions. What do I ask for when shopping for one, are they fuel injected and it they are can they be changed to carbureted? I would want a manual transmission so I would need one with a flywheel so I did not have to aftermarket that part.
Any guidance and advice appreciated. :popcorn: