FWIW, Other than parts it's time and sweat. I did my '68 RR out in dad's driveway over a couple weeks while in HS. The auto hump for the B-body remained with a cutout alteration for the shifter and a little messaging for linkage clearance.
The A-body is tighter and the linkage is longer, so I believe you'll need to take the hump plunge. In your haste to get it done, take care to not remove too much floor and make absolutely certain you don't cut out your trans cross member!
The bell crank ball frame mount for these cars are cheesy IMO but should be fine for a good diaphragm clutch set. Try to find the "HD" peddle set if you go the standard mechanical clutch linkage with either the diaphragm or B&B. A "HD" B&B might need some firewall bracing as the spring load is increased.
