...77cc, and so your 318 comes in at about
(658.9+77)/77=9.56 Scr. The quench is gonna be too tight
So the bad news is that even with the stock 318 cam (Ica of 48*) at 9.56 Scr, she's only predicted to put out ~150psi.
By the time you get to two sizes bigger, a 262/266/110 cam, (Ica of 60*)...