16.7 track proven LOL... so I get this is your family project and it makes you happy because it's getting the youngers involved, which like you said they are no part of this forum or read it or know what's going on.. and I wouldn't be busting your seeds if you were some kid trying to puzzle together the only thing you had on a shoe string budget..
You have two Dusters a garage full of Parts new aluminum heads for big block and small blocks, headers coming out of your ears, carburetors O plenty and intake manifolds to spare new and used... At some point 16.7 just kind of boring when you have the capability and resources to do much much more...
What's going on with your a bodys you know the Forum here the a body forum...
I'd love to see your 13-3 duster do an 11-8..