72 Swinger Project

Or not.. Need some advice. Don't want to open a separate thread. This car was a slant 6. That harness from bulkhead is long gone. I clearly need a V8. For the quick and to get it running can I get a 72 V8 and plug it in to the bulkhead? I can rewire the entire car when I pull the interior and do the dash and aftermarket gauges etc. I will use Ron Francis for that job. Thoughts and where the hell do I go from here?