72 Duster: Here-we-go

okay, I need some input. And where else should I look but here?! ( I'd ask all the doctors and scholars I know, but that's a short list) It's obvious the members on this site are WAY better and smarter! Wife & I are torn:....build a 6.1, maybe an Indy w/mod man 6pack or that 440 w6pack? the big block sounds awfully nice but the 6.1 is soo much lighter and can crank up the HP so fast. I want to hear the sound of each....'specially the 6.1 carburated. can anyone help make this decision??