[SCOTI]

Prop valves are for safety as well as function once they were introduced. One can bypass them but you'll still need something to allow adjusting front & rear bias.

The fronts are usually 70% of the stopping force so something needs to be able to tune/adjust the rear. Factory prop valves are intended for factory applications (tire sizes). Once different tire sizes are used front & rear, the bias changes. Whether it's detectable or not is debatable & subjective.

Later model master cylinders will work so they don't have to be 'year model specific'. You'll want/need to use the proper bore size for the brake application. Manual brakes, power brakes, Hydraboost usually all require a different bore size. Bore size impacts pedal feel/force required. The plunger depth can also be different when using/mixing parts so you have to pay attention there as well.

My recommendation is to stick w/a kit if you aren't familiar w/this info already. Kits are usually based on a good combo of parts for a specific application.