You should be able to just get a good Chrysler electronic distributor for about $20 and HEI it if you want. Those are reliable and really easy to come by. Get a box and wiring harness off your favorite website and buy the carb and intake of your choice. These are probably the only parts for these cars that you can still find without any hassle. Despite what you may hear, you CAN use the very common 360 iron 4 barrel intake. It will work fine as long as you have a spread bore carb or adapter. The ports don't exactly match, but the engine will pull what it needs into the cylinders and it's fine unless you are trying to set some kind of horsepower record and those intakes are easy to find and cheap. I put one on one of many from my parts pile onto one my 318 wagons and it's a lot better than the 2 barrel ever could have been on it's best day. The LA needs to breathe. All of these parts are very easy to come by