Allowed PA to cool for 2 hours then using the correct KD tool, It was no problem to remove the GM clamps.
The smaller diameter hose had the beginning of a split and I decided after careful inspection of the other larger diameter heater hose, that only the one hose needed replacement. The Gates hose from Napa was a perfect fit,no trimming required at all.
After using the KD tool it was discovered that the GM clamps were in perfect shape and perfectly round, so they were easily re-used with out any leaks. These clamps I like better personally.
It should be noted that no draining of the rad was required. A small pan was put below car and I drained only a few cups of coolant into pan. I disconnected the first clamp and pointed the one side of disconnected hose down towards pan, allowing to drain, before removing the other clamp and then the entire hose.
The rad cap was left sealed during the above.--DONE--