how 'stock' is the 454 ?
what size (length) oil filter are u using?
as i recall, mine was typically twice as long as the stock 454 filter and took about 1.5 pints of extra oil...
later i added an additional oil cooler, again the cooler and hoses increased the oil capacity.
i'm pretty sure the fluid capacities was/is in the a/s owners manual, but became irrelevant after modifications.
no recollection of the oil pressure readings....
all of the true things that i am about to tell you are shameless lies. l.b.j.
we are here on earth to fart around. don't let anybody tell you any different. k.v.