No B-body came with McPherson struts, including the Charger. Although there may be some minor differences, B-body K-frames (and possibly the suspension components attached to them) will bolt up to E-bodies. I don't know about parts interchangeability, but the front suspension is exactly the same set up.
As far as the rear ends, I believe the B-bodies up to 1970 had leaf springs that were more or less parallel, whereas the E-bodies and 1971 & up B-bodies had leaf springs that kick out slightly. Don't know if that affects handling at all.
Other than that, the only difference would be wheel base. That probably had an appreciable different feel. I don't know; never drove a B-body.
And what does he mean by old school 'Cuda? Old school as in A-body when 'Cuda was simply a nickname, or the official 'Cudas that are the high performance E-body Barracuda?