You will need a clutch pedal, you can trim the pedal metal pad of your current brake pedal and get the narrower brake pedal pad for manual trans cars, some sort of clutch actuation whether you choose to go with a cable or stock linkage or hydraulic, you'll need a new trans cross member, reverse backup light harness, new flywheel, new clutch and pressure plate, new throwout bearing, and it's likely that you'll need your driveshaft modified.
My 70 mach is going from the FMX to a 6 speed, so I've been slowly collecting all the parts needed. I would recommend going to
www.moderdriveline.com to see what kits they offer for the 5 speeds. A T-5 may work OK behind your motor since it's fairly stock, assuming you don't have wide rear tires or slicks.
I too recommend keeping all the original parts you take off. I'll be doing the same with mine, although my trans is original to the car whereas yours is not correct.
