Coil Over vs Torsion Bar

paying for labor- out of the question.I can't even afford myself. the hemi and headers do not know what platform they rest in- if they clear the trans and trans cross member in a B car they should clear in an A car. the subtle difference would be eliminated with the coil over suspension-I hope.
more issues with valve cover clearance than the headers I'd think ,but I haven't yet set it in to find out just how wrong I am. if/when I get far enough along to find all this out I'll post and we can go from there.