I'd be looking for 185 #'s of cylinder pressure to be somewhat happy.
BTW -- if you want to make a cam "bigger" -- go with 1.6 rocker arms -- and since you're pulling heads -- you COULD/ABSOLUTELY SHOULD - check your piston to valve clearance. Even if you don't go with the 1.6 rockers -- you'd at least know that clearance and it would save you pulling the head to do a higher lift cam - or as above - go with the bigger rocker ratio.
I notice the SB383 uses 1.5 rocker ratio..... which is actually pretty lame by todays standards for making power. Sure - the 1.5 is easier on valve springs - but you're not daily driving this car.... and you do good maintenance.
That's the other thing you really need to pay attention to BTW --- WHAT SPRING and installed height etc the chosen cam is suited to run with. And what length pushrod you need for the new choice. Overlook that small detail at your own peril.
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