Could my 340 block be filled?

Put the new radiator in and a new thermostat. The new thermostat didn't come with a new gasket so I assembled it and used some permatex to make a gasket. Didn't turn out to good as it was wet after running the car for a while. I got a gasket they had in stock at Advanced Auto. Fired up the car and drove it for a little while, maybe 10 miles or so and the factory temp gauge went up to like 3/4. I didn't install the analog gauge I have on hand yet to see the number though. Drove past it and was in the process of taking my car home and she stopped running while driving.....Lost spark for some reason and pulled off the road. Popped the hood and just looked and saw nothing obvious. A guy pulled up and offered assistance which was nice of him. I told him I was going to let it cool down and try to fire her up. I just checked connections and let the car sit for about 10 minutes or so. After that I dropped the hood and got in and turned the key. She fired up and I was able to limp her home without a visit from the AAA flatbed. The car is frustrating me to no end. I'm not sure if its the orange electronic ignition module I bought that is causing the latest issues but I've heard a lot of bad things about them. The upper radiator hose felt like it had some pressure in it but not that much. I am going to try to bypass the heater core and install the analog gauge to see if it helps at all. That's my next step. Oh the pain.