Interesting the "shorts" won't clear a RB with 143 t - 11" flywheel without a 300+ starter. They have the same FN for the "long" tube.
I cant imagine why one would need the mod Z-bar with "shorts" though.
Even the Schumacher's need a mod for the stock Z. Several here have posted their fix.
I did these on my 440 years ago to replace same from the late '70s. I can't tell with the picture you provide whether they are the same or not. Allegedly fit a B engine as well.
Hooker 5215HKR Hooker Super Competition Full Length Header - Painted (holley.com)
