I was friends with a dude a while back that claimed to be spraying quite a bit. It was a ported E7/GT40 intake car, can't remember what else he had in it. A lumpy cam of some sort.
Anyway, IIRC he was either spraying 150 and was talking about moving to a 200 shot or spraying 200 and talking about spraying a 250 shot. I really can't remember, this was a few years back. Either way, I remember it being a lot, and he beat the dog piss out of it and it held together. It was a fast car, at least from the butt-o-meter. Never saw it run at the track.
Moral of the story is, I don't see why you couldn't get away with 175 or more, providing you have all your ducks in a row. These little 5.0s can take some abuse.