I think your assumption is correct, penetrating oil, heat & brute force.
The pin has probably rusted where it fits into the pedal box either side.
Is the pedal still not moving ? This runs on bushes on the pin, you should be able to get the pedal to move otherwise this is more resistance as you try to remove the pin.
I've had a few that were well & truly stuck together.
You've also attached a couple of pictures of the water pump with a bolt blocking an outlet.
This would have been for a heater, when you buy a Holden water pump this connection is there but often internally it's sealed, you have to drill through if you want to use this connection. Fell foul of this recently on the young bloke's Corona (Holden Starfire motor), previous owned had fitted a new pump but the heater wouldn't work.
Flushed the system tried various things then checked the pump and the heater outlet was sealed !! Drilled through and all works OK now.
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
'58 Series II (sold)
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C
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