Does any one have a solution for high oil pressure?

Ive got a 1970 block which had been redone with the best of everything. Not to bore U with specifics. I believe there has been an oil restriction plug installed in an oil passage somehwere which is boosting the psi to 80 lbs at idle. I have been trying to find out who can provide info of where this restrictor could be places and some people say behine the timing chain and others behind a plug in the bell housing. Any help would be appreciated.