need help converting to manual brakes ASAP!

[1FaastC10]

working on my derby truck today, i got the motor and trans in and started to put the headers on. i ran into a problem, the power brake booster. i removed it, and bolted the master cylinder directly to the firewall. does anyone know if this is going to work if i can find or rig a pushrod to it, or am i going to have to convert to a manual brake master cylinder in order for it to work. keep in mind that this truck wont be street driven, will never see speeds of over 30 mph, and well, hitting other vehicles isnt a problem. i just need it to stop well enough to load onto the trailer, pass inspection, and make my way safely into the derby pit.