Hey Joe, which valve goes to the fuel inlet and which valve goes to the overflow? There are two valves on this carb...First off, take off all fuel lines and throttle cable.
REMEMBER TO PUT ALL THE GASKETS PROVIDED
#1. Take the airfilter off your stock carb.
#2. Unblot the carb. Take the carb off
#3. Unbolt the intake manifold. Its that black thing with 4 screws on each corner
#4. Install the Manifold that came with the Walbro WT-603
#5. Bolt the Walbro to the manifold.
#6. Put on the airfilter
I think thats it....post if you still need help or if your stuck somewhere