Engine oil weight

What are the things a person needs to look for when picking out a synthetic oil wieght for your particular build?
Mine- street/strip.
521 cu in. 10-1
small roller
FRPP SCJ heads
Hyflow Dynamics oil pump, stage 1 oil mods.
Motor has great oil pressure now with half 30 wt. and half break-in oil, just need a recommendation what to change to.
Thanks
Dave

It'd depend on the clearance at the rod and main bearings.

Thanks Lem,
I will review my notes and check what my clearences were. Does it matter on the ring gap clearences at all?
Dave.

No......because you don't gap the oil ring package.