My guess is that you're going to run into a lot more complexity on the 33 - due to the way the center XMember comes together - then you also have the issue of having room for the shifter. What most folks do is drill the rivets out of the original 33 frame and remove the stock x-member, then fabricate a lower transmission mount. I believe that 'Chassis Engineering' has a kit already fabricated for this purpose. One thing to think about is that you will definitely weaken the frame - but with the horsepower of a 59AB, probably not an issue.
Another approach that is very popular is putting a T5 5-speed behind it (as it has a top-mounted shifter - no side linkage to screw with). You'll find this an easier situation to fit into there (at least I think so). Good luck and take some pictures!
