Another question is what are you doing with the 318? stock, it's an easy swap. Just get the conversion motor mounts from Schumacker. You'll need A Body headers, not the ones that came with the B body. Remember, your front end is set up for the slant, so you probobly have drums up front. if at all possible, get a 318 K member from a 73 and up A Body. You'll get the bigger disk brakes with that. V8 904 tranny's can be found almost anywhere. Hell, I have one in my shed from my 318 to 360 swap. Also you might want to get the Mancini ignition kit for about 200 that includes coil, distrib and orange box ecu, mine also came with new Accell wires. If you go with the 318/904 route, you should be able to get a drive shaft from any bone yard. If you live in So Cal, or are close, I have a bunch of those parts.
Stu