225 running a bit warm!!!

Years ago my 225 was overheating and it was caused by 2 problems. Since I was rebuilding the head anyway and had it off I poked a screwdriver into the rear cylinder water jacket and got nothing but rusty mush. I cleaned it and flushed it all out and I had the radiator boiled and cleaned at the same time. After putting the engine back together it never got hot even on the hottest days. In retrospect, I probably should have boiled the block but they would have been a lot more work and expense.