Clutch kit recommendation needed

If you are using the 10-1/2 bellhousing flywheel etc. from the 340 I recommend the McLoed Street Pro as previously mentioned. You will need some linkage mods to use the 10.5 bell housing but it's pretty easy to round up the pieces or Brewers sells them.
If you keep the 9.5" flywheel contact American Powertrain. They can put together a 10" dual friction diaphragm clutch that will fit and hold. I had one in my car for several years before I switched it to the 10.5 setup.