swapping a 440 into a a body

Guys I went another route. I bought a DC spool type K. I have TTI 1 3/4" headers but all I see are automatics in threads. I am building a 4spd car. I found a 372 bell to fit my tranny to a BB but am unsure of why some people can use a TTI z-bar and why others seem to have clearance issues. Any 4spd guys able to chime in on 4spd swaps?