I have replaced everything from the fuel
department to the timing chain to plugs,wire
everything in the firing area. My no. 3,4,5,7 are
not getting any pressure up whats could be
Clarify pressure, no compression? As the injectors are on a common pressure rail they all get fuel pressure at the same time, unless something has blocked the little screens in each injector, have you checked injector power and trigger signal on suspect injectors?
If you have no compression on those cylinders you could have the cam timing has been set incorrectly. Also keep in mind the 302 and 351W engines have a different firing order.
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