Brakes!
Yea, there is an after the market booster braking system. No matter
what is a lot of work. Use a later truck rear end just by measuring
end plate to end plate on your truck. Go to a jjunk yard or search for
lenghts like this sight
http://www.geocities.com/MotorCity/Speedway/6432/axle.htm . In Hot rod
magazines there are adds showing brake boosters that are 8 inchs in
diameter (small!!!!) with choice of overhead or floor foor pedals setup.
As for the front, go with disc brakes. Stopping is very important these
days! Look for straight axle kits or junk yard 1 & 1/2 ton trucks.
Jim-z