New to the forums, new to the big truck world. Brakes?

[68-Chevy-C50]

I recently picked up a 68 Chevy C50, I have got it running and I am able to drive it around the farm. The problem I am running into is with the brakes. I am able to stop the truck after multiple pumps of the brakes, I attempted to flush and bleed the lines, however, I am only getting a small drip to come out. Any suggestions on how to either fix my brakes in a different way, or solve my bleeding problem? Thanks!