Coil Over vs Torsion Bar

well now I'm confused- I've been seriously considering the coil over front suspension, but the argument for the torsion bar which I've always seen as awesome suspension, looking like a keeper.
my issue is-I have 2-1/8" headers for a '64 B body and I don't think they will clear on the A body platform, any comment on that? (comment meaning help)
Are you thinking a coil over suspension conversion is gonna be cheaper than headers that fit?