I am stranded in Atlanta and need a mechanic to put a Chevy 454 engine into my stepvan.

I'm a van dweller in a p42 Workhorse and I need a bigger engine installed. My parents offered a spot in their driveway for me to use. I hired a mechanic at the beginning of the summer he pulled the engine then flaked. My summer has been wasted and I need to get back on the road again. If anybody does any side work or knows of a shop that'll do work on a step van I would appreciate any information.