Dash Lights, Carb, Radiator issues

Hi Everyone. I'm new to this forum. I heard about it and checked it out. You all are great and I think its refreshing to find such helpful people! I hope I can help some of you at some point as I'm a custom painter of autos and motorcycles and built several choppers and owned so many Mopars I lost count long ago but I will need some help with this one because when I got it I knew it was not quite complete. I live in Indiana and have just acquired a 1966 Valiant 100 2 door post with a 225 and 3 on the tree from California. It hasn't ran in a long time I'm guessing. The previous owner did not know much about it. He got it 3 years ago to make a drag car out of it and never got around to it. I'm leaving it stock so when it finally got here I looked everything over, topped off the fluids, put fresh gas in it, tightened up anything I found loose, put a fresh battery in it and bam! I was so happy I got it running! Then I was even more shocked that when I pushed the clutch in and put it in gear it moved! lol. I disconnected the battery, cleaned the fuse box, put new fuses in etc. and one by one got all the lights and gauges to work with the exception of the dash lights that I'm still trying to figure out. I don't see how all the lights can be out at once so I'm ruling out bulbs for now. So that is one of my problems I'm working on. Also what I mean by I bought it not quite complete means that the radiator and fan were gone and someone took the choke thermostat and rod off and its gone along with the choke return and put a manual choke cable on it. So my next question if anyone knows what size radiator did it have? a 19 inch or a 22 inch? I think both will go in there. I measured the opening and its 23 1/2 inches. Any suggestions on the best place to purchase one once the size is established. I was thinking the 22 inch would do a better job cooling but I'm not sure. I want a stock type radiator. My last question for now is I want to get a new carb for it and put the proper choke stuff back on. Its a tough one to find. The tag is gone but I've been told it is a Carter #5-565. Its a single barrel. Anyone have any idea where I an get one? I want to replace it because looks like someone rebuilt it and stripped the lower housing threaded hole where the main brass gas line goes in with the needle and seat on top of messing with the choke stuff so I just want new. The motor sounds very strong and I know it would run so good with a new carb or a re-manufactured if its done by a reputable source. Thank you so much for reading this and if you can help me I would deeply appreciate it. This forum is a wealth of information and such nice people and so glad I have the opportunity to join.