Clutch Z-bar question

[69 Short Fleet]

Are there 2 different clutch "Z-bars" (that pivot between the block & frame)that were made for our trucks? The PO switched out the I6 to a 283 and I think reused the original Z-bar. The engine in its furthest rear position (closest to the firewall). With the Z-bar I have it aligns the brake pushbar (one that goes through the firewall) off-centered and the pushbar rubs on the top of the hole in the firewall. And does anyone have a pic of the two side-by-side to help clear this up for me. I'd like to get the proper one. Thanks Doug