O-470-11b not getting fuel to middle cylinders

[Coreymills475]

I have a 0470-11b with new angle valve cylinders and pacemaker ignition I put a updraft M4a-5 crab updraft crab on it starts up but not get fuel to middle cylinders

 

[John Fenner]

Be sure that the injector holes are plugged.

 

[Dirtman]

Check for vacuum leak around those cylinders