Herc C130K
I think you are/were still a bit hypoxic! The C130K model was an H model replete with -15 engines but with a British Smiths Flt Inst System.
The highest I ever got in one was FL310, and that was on an Air Test c. 1975 when the airframes still only had 5-6000 hours on them.
'Happy Days' from one Oldtimer to another.