440 what am I missing here?

That isn`t even noticable most of the time on ''bigger thsan 400'' engines
Why would trickflow design this topend kit if the lsa was so horrible,and caused compression issues that makes no sense. I will check the timing next time I get the truck out I could be wrong going off of last memory of checking it. As far as headers go I have manifolds on it. Only thing that would fit. Distributor,and coil are E3 parts basically a rebranded blaster type

Before this dam att/computer started jumping around , I think I caught that u were running stock exhaust manioflds , that is big part of ur problem , with the rest of ur set up=wrong combination !!