Radiator spouting off steam

[Nomad]

Hey guys. Finally got my truck on the road. Having an issue with the radiator cap spouting off steam out of the overflow nipple once it warms up. Did a search but didn't turn up anyone having the same issue. The truck is running at temps of 200-225 when this happens, from what ive read others trucks run at normal temps of around 185ish. The truck has sat for about 20 years before I purchased it. It has a stock McCord 944059 radiator in it and had a stant 16lbs cap on it. I flushed out the block and radiator and ran a radiator flush product through it. I replaced the stant cap with a new stant 16lbs cap and its still steaming. The thermostat has been replaced but i dont recall what temp the one i used was, im wanting to say 165. When I replaced the thermostat several months ago it appeared that someone had removed the hose into the thermostat housing and took a screw driver to the thermostat. Im guessing the truck suffered from an over heating issue in the past due to the previous thermostats fate. Im thinking that ill pull the hose off the water pump going to the thermostat housing and check the flow rate, and maybe try to remove the thermostat. Wanted to see if anyone had similar issues/solutions or suggestions.

Thanks,

Damon