Help with brake modernization

[madkow70]

I recently picked up a nice '68 K1500.
I so far love the truck but the brakes are appropriately horrendous.

I'm not trying to restore this truck in all original parts or anything so I'd love to modernize the brake set to make it a bit more safer.

obviously disc brake conversion for the rears. but might as well upgrade the fronts too.

question: where should I (and can I) pick up a ready-to-install set somewhere from internet vendor?
any other components under the hood need to get updates as well for this?

help.