.how much mould board below the bolts?

I have a 1991champion 740 a that I bought a couple of years ago to maintain about 6 miles of gravel road.it had a couple of inches of available cutting edge when I bought it that's now worn down to less than an inch. When look at the
Mould board I see it's been worn off some in the past. I'm fact at its most worn point it is just about even with the washers on the bolts holding cutting edge on.other areas it's an inch from the washers.question is if I put on new 8 inch edges will this...

.how much mould board below the bolts?

.how much mould board below the bolts?