sticking or floating valves

I recently bought a 73 duster with a 318. It had sat for a while and had old gas in it but it started and I drove it home. It has a edelbrock intake and carb. When You nail the gas it don't really do much. It kinda moans and accelerates slowly. It does gear down. I decided to install a mild cam. When I took it apart I found two bent pushrods. I replaced them and the cam and lifters but did not replace the springs. After breaking in the cam I took it for a test drive and still have the same problem. I replaced all the ignition parts except the distributor. I also replaced the carb. It will cruise along ok but when I nail it doesn't have any power and sometimes backfires thur the carb. I took the sparks plug out which I had just replaced and found one bent and two with the ceramic part broke. Done a compression check all were in the 115 to 130 range. Anybody know whats going on here?



















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