Hi, need help for neighbor.

454 .030 bored
Forged pistons
melling high volume pump
all new bearings
Crane cam
Crane lifters, springs, pushrods
off brand 4v aluminum intake
New Holley 850 cfm
large sump oil pan
All installed in a boat.

Upon startup, blew oil filter off twice -80 psi on gauge
inspected oil pump and bypass valve rusted in place, cleaned
and pressure at 60psi.
Took to lake and inspection of rocker balls showed some blue
and some bluing on push rods. very little oil on valve train.

Pulled motor, used drill to run oil pump - tiny amount of oil coming
out of lifters, installed gauge at rear of block (60psi) installed gauge
at front of block by timing chain (52 psi) still not pushing oil to
valve train.

Where should we look? Possible volume problem? Stumped!
Please help.

Scooting