99% of it is just bolt-on. You say the engine is out of a '65? Chances are it's a C5 and earlier 200. That limits you to the 8 1/2" recessed-style flywheel and smaller bellhousing choices. If you are planning to do clutch dumps to spin tires and such, you want a stronger tranny. Either a V8 3-spd, 4-spd or T-5. You'll need an adapter to get any of those trannies behind it.
In addition to the flywheel, clutch, pressure plate, pilot bearing, t-out bearing, clutch fork, block plate, bellhousing, etc.. you'll also need the z-bar clutch linkage, clutch pedal push rod, clutch pedal assy and new brake pedal. If you want to use the V8 3-spd or 4-spd, then you can use your existing driveshaft. If you want to do a T-5, then you'll need to shorten your driveshaft by an inch.
There is plenty more info including tranny swaps and adapters on my page:
www.inlinepages.com
However, check out Doug's page:
www.inlinepages.com/inlinefever
Here's his car in stock 200 form w/ a C4 doing incredible burnouts
Al