damn man... you kind of ripped on him there.
To answer your question, i would say yes... and i wouldn't stop at 10. Back when i first started working on 5.0's i would set them at 14, but i'd run 93 octane too.
He is right about the TB and MAF comment though, they should be on the list... and the stock heads just cant do much with that cam. if it will be a while before you're gonna have the funds for heads (something i know all too much about) then timing at 12 and a good AFPR will bring up the power a little. (actually from 6 to 12 would be a nice increase) but why did he set it at 6? of course the spout connector was out, but was it beacuse the cam doesn't want to idle smoothly at 10-12? sometimes our computers dont like the lift... good luck