Let's see....where do we start? The Vortec motor is a roller cam motor with no fuel pump lobe....so you have an electric pump to deal with. The intake manifold bolt pattern is differerent.....you would have to go with an aftermarket manifold (assuming a carburetor). The old manifold will not bolt on. Depending upon what the new engine came out of, the pan may be different as may the flywheel ring gear with the converter bolt patern. The serpentine belt bracket bolt pattern is probably different since Vortec heads have a different pattern in the ends of the heads. The changeover can be done....it just is not a cheap bolt in deal. By the time you buy another intake, fuel pump, and whatever else, you've blown your "cheap engine" advantage.

Mike in Tucson