727 swap

What 73 said and a flex plate and engine to trans. support brackets. Some guys say they don't run the brackets but I always like to for the extra support for the lower part of the bellhousing. The passenger side is the same on all years but the drivers side changed in 74 so make sure and get the one that corresponds to the year of your engine block. Only thing I'm not positive about is the crossmember/mount. I haven't worked on any 4 spd cars so I'm not sure if the crossmember is the same. Maybe someone can comment on that.

What is the cars purpose? If you plan on much street driving you'll definitely need some more street friendly gears as 4.86's will be screaming at 45 mph. If it's an 1/8th mile drag car your ok. If you want to run the 1/4 mile you'll most likely need taller gears as most strokers don't spin 8000 rpm

One last thing, make sure and get a converter with a stall speed to match the engine/cam requirements and run the biggest trans. cooler you can fit in.