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@TheShipwright
Have you measured the inside size of your frame where the h/s cups go? You also need to measure the external face of the h/s where it goes into the frame. There's normally something like .2 or .3mm difference between the two as you want a snug fit and this intended to create a snug fit. Because of this you also need some way of "pressing" the cups into the frame. There's tool you can by but they're uneconomical if you're only doing it once in a while.
You can make a press with a couple bits of wood and long bit of studdingand nuts/washers, google "diy headset press".
The bigger issue I'd say before going any further is to determine if the crown race is the right size before fitting your cups.
I think there's two sizes 26.4 and 27??? I'm not 100% sure but you need to ensure the crown you've got fits the crown race seat on the fork.
Again these are friction fit so you need some way pressing on.
good luck