Bolts/screws not tight. Wrong gaskets in carb or between carb and manifold. Float setting wrong. Fuel pump pumping too many PSI's.(as in: wrong pump) Vacuum leak. Needle fell off hanger or set wrong. Loose fittings/hose clamp, broken/cracked hose, etc. Throttle shaft leak, mis-assembled accelerator pump. There, that narrows it down for ya.
You really, really need to define to us where it is leaking. Start with dry carb, extra person, powerful light, a mirror for the rear and a fire extinguisher. "Showers out" ???? Big leak? Of course the big question is when did it start? After rebuild carb? Right After new line and pump? When did it not leak? I know nothing about 216's but have had those kinds of leaks. The 216 boys will know better.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn