Thread: gmpp 290 hp 350

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Hi All. New member here.My son and I purchased a gm 290 hp crate engine and installed it into a 1988 s15 shortbox.TCI street fighter th 350 trans, TCI saturday night special convertor,new summit dist,new edelbrock 1405 600 cfm carb new waterpump,corvette rad etc.The problem we have is it smokes like its burning oil on the passenger side bank.The only thing not new is intake ,it is a crosswind intake from e-bay.I pulled the plugs looks like #4 is the culprit.The engine runs strong lights the tires easily,antifreeze stays up no other problems.We have about 300 miles on it now.I marked #4 plug and the fouling is only on one side of the insulator,and is facing the intake valve.We followed the break in procedure exactly.primed oil system etc.I have pulled intake once and replaced gaskets ,thinking it was sucking oil from valley,but seemed to be fine.Runs with 15" vaccum at idle,is this normal.I will try and post a picture of the #4 plug.I have no warranty as was over one year before we got it running.Hope you guys can give me some ideas.

thanks.