383 intake gasket and valve cover choice

All back together and picked up a slightly used 750 quick fuel carb as the Holley that came with the car has been problematic. Those Moroso valve cover gaskets are nice. My son drove car one day. Then today we but on the quick fuel carb. My son took it for a ride said the car runs awesome never this good. So I went to take my first ride and it backed it up in the driveway I noticed the oil pressure gauge (actual mechanical oil fed aftermarket gauge inside car) is reading zero we know it was reading good pressure earlier today. Shut off car Checked to make sure there was no restriction where it screws into the back of the engine block. Also can see the plastic line has no oil in it when running. Engine sounds OK but it’s starting to tick so obviously there’s a problem what do you guys think ? Seems awfully coincidental we just had the intake off engine oil was changed with this job and is still crystal clear and we did change the filter.
oil pump failure, bad oil filter , clogged oil pan pickup, spun bearing ugg where do I start. Just did all this work hoping we could get reliable car until the winter and then build another engine this winter. We just picked up a 400 block yesterday actually.

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