fuel injection

For 2500 you can come close to buying something like one of the Holley or Edelbrock systems. But that's why we need more details of what you want

You can either modify your own manifold for multiport, (have it modified) or buy certain manifolds with injector bungs already in place

You can go with TBI which CAN be a lot cheaper, and CAN use out and out factory carburetor manifolds.

I have not kept up on the array of Holley stuff, but some of the new stuff is more "self learning" and can be programmed with a handheld accessory display device, instead of a laptop.

One member on here recently installed a new tbi system built to resemble a 4bbl carb.