K-H brake swap done, but doesnt stop!

Garrett Ellison said

Don't Drive It! The master cylinder doesn't have enough fluid volume to operate the calipers, all the fluid is going into them and not doing anything, well not doing anything significant anyway.. Well, I guess you might could use the emergency brake in conjunction and do a little something resembling stopping but is it really worth the risk of wrecking your beloved project for? The proper master cylinder make all the difference in the world. Care to tell us about the rest of the car?

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Nonsense

Is the pedal "hard?" How far above the floor is the pedal with lots of foot pressure?

OP you haven't told us a bloody thing here. What year is the car? What brakes did it COME with? Power? Manual? Did you install a metering/ proportioning valve? Not enough info............

Also what condition are the rotors? New? What kind of pads did you use? And some pads need a bit of break in, a few miles............