Trying to get rid of some things

I think he needs to deceide, turbo or non turbo, right away. and build acordingly. To build nonturbo, and have real good performance the compression ratio and cam will be totally wrong for a turbo. A non turbo street type motor doesn't need parts like "O" rings, head studs, main studs. ARP rod bolts maybe, but only if doing a recondition of the rods. I wouldn't build a turbo engine for less then 10 lbs boost, and upper 9 to one compression is on the high side for that. At 10 lbs boost a stock cast piston will work, high dollar parts like studs are not needed. The OP really needs to do some studying of turbos, and turbo slants.
I was running a stock 170 short block except for TRW forged stock replacement pistons, at 10 -12 lbs boost. I did wind up "O" ringing the block, but my problem was detonation. When I did mine there was no such thing as "boost timing master", AFR gauges, etc. It was hard to get the tune up correct. I would have been better off, not "O" ringing the block, and letting the head gasket act like a "fuse" and blow the gasket, instead of hurting pistons, when getting into detonation.