well there is many that build engine s to 800 .comp products at one time had some thing to do with some big offshore boat engines .it is not very hard to get to 800 + with the right part s like from sonnys a 5inc bore spacing block and a 5.500 carnk can get you to hi 790s you need alot of $$ i am doing a  small one 734cid  that i ...

the 10 psi pre 1000 rpm  is not really worth much i have built many bbc that only made 65 psi as long as it is going up with rpms and not droping you are ok you would wear out the dist gear and wast HP trying to get more psi  would be a very good idle to put the windage tray back in to have some oil control at hi rpm