Overheating problems

Hello, I need some help. 22 Model T Touring. Seems to run hot, but I think it is a couple of problems. A) no thermostat,

B)water rushes out overflow tube after you shut off engine. C) supposedly the radiator was rodded & cleaned a month ago, D) I believe there is gunk in the block & radiator. What can I use to flush the block & radiator without damaging metal, gaskets etc. Reply to: [email protected] PLEASE