What main bearings for a high performance engine?

Duane said

Unless you have some kind of casting flaw in your block, there is no rocket science to your oil pressure issue.
You asked earlier what block mods you should do which tells me you are not familiar with some common sbm oiling mods that would help your oil pressure.
That's why I asked for more info on the motor. Not just bearing clearances, but roller cam or not roller, tubed or bushed lifter bores etc. There should not really be a mystery to the pressure problem imho.

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Thanks for your reply mate
My other magnum engine and a friend with a magnum engine have average or pressure of around 60 PSI at full throttle and 40 at idle so there does seem to be an issue with this engine.
It's a complete standard magnum bottom end. With standard crank bearings and rods. I used to run the standard roller lifters and still had oil pressure problems but now I run solid lifters and cam. I contacted a Mopar performance engine building shop and they said they could do some oil modifications for me that would improve oil into the bearings but probably would not improve oil pressure.