While I agree with checking the manifold for leaks...
I would also check the following.
Since you did quite a bit with the fuel pump and enricher...
a) disconnect the fuel inlet at the carb
and stick in a cup, jar, whatever
b) turn key on
c) aside from the clicking of the pump, you should see quite a bit of fuel flow. If you dont, start working back up the line till you do.
d) if fuel flow OK. reconnect fuel line and open carb drain line, repeat test.
e) try items below and if they are OK, I would pull the carb and clean it just to be sure it didn't gum up.
I would then check the plug seals on the cylinders to make sure the seals you put in are correct.
check that the enricher is properly connected to the carb.