Dulcich 408 on dyno - offset heads

I’m
I gotta find out where they were sucking oil from. After two tries I put my other proven set of heads on. (And intake) That was supposedly a brand new Indy intake I bought used and on two engines I had issues with the engine sucking oil. When I pull my 422 apart in going to take some measurements off both intakes.
So what’s the hp limit on the stock 340/360 blocks?