Engine leaning out at 3000rpm

Yeah thats some good stuff thanks i have a holley hp150 fuel pump pulling from a stock tank with a comp engineering sump tig welded in no pickup tube 1/2 inch fuel line holley regulator i will definately check the header bolts to make sure they are tight for the popping the bog however is what concerns me i started with a quickfuel 850 ran great but way too rich wouldnt idle right so i tried a friends brand new 750 hp the car liked it but still lean bogged not as bad tho so i bought a brand new cnc billet main body blp weekend warrior carb tuned by devane carbs wich id awesome by the way and it is better but still gets that lean bog 3000 rpms was just rolling into the throttle to pass agressively or anything for that matter much above 2800 and it starts getting lean and acting stupid pressure stays at 7psi and jet extensions did nothing to help tried every friggin power valve and pvrc jet possible no difference no matter what i do to the carb its like it has a manifold leak but i cant find one