Weight of 7 1/4 vs 8 1/4 vs 8 3/4 vs Dana 60?

Thank You, Rusty. I certainly can appreciate your knowledge. If you don't mind could I message you on how I am coming along and get further advice. I think I have a good starting point now. I had my original 120 spin a bearing and I haven't been able to find a bottom end rebuild kit. I'm ok with that because the 170 wouldn't pull the hat off your head. I just bought a Super Six Engine 225 out of a 1974 Duster, so this gives me some hope that I can put some additional power behind the Slant 6.

The Super Six was not an option until a good bit later, so be careful what you have there. And sure, message away.