318 to a 390 or 392 stroker?

for the 390 it would be .030 and for the 392 it would be .040. It's a late 70's 318 so I'm kinda iffy about the .040. Do yall think it would be safe to go .040?
I know the early 318 you could easily do .040

Is it even worth the .040 to say it's a 392? Lol