Doing this swap on my 1972 Challenger now...Most times, you are better off just buying everything new as some of the items bought original will cost you more than buying repops...
IE: Clutch linkage, Z-bar, Shift rods can be homemade as this will be how I do mine as E-body stuff seems to be high as hell...The little bracket on the frame can be homemade as well...I'm even palnning on making my own hump out of a cheaper B-Body hump..Sure, it may not look correct, but who cares? right? it's under the carpet....
Bout the only things you can't make would of course, be the trans, shifter, ball pivots and bushings, bell housing, clutch fork, and pedals....I've done this swap on MANY B-bodies and have done it for as little as $400.00 using used parts, but again, E-Body stuff seems to be the retirement plan for most who deal in it...