Car bogging out, need suggestions
 

whats up everyone.....ok my 88 5.0 has a newly rebuilt engine...stock block, manifold and intake...70 mm throttle body 19lb injectors stock cam......car runs fine but it bogs out...i can leave the line at 2000 rpms or 4500 rpms and it bogs out....i know i need rear end gears nut why could it be bogging out??

throttle body is huge for those mods. You prolly lost 20 hp goin to a 70mm vs. stock tb.