Lean burn removal

That kit will work but you would probably get off cheaper by going the HEI route.
For that all you would need is the same electronic distributor, a 4 pin HEI module, module heat sink and a relay. The relay can be optional, but it assures a good 12v power source to the HEI module. You would make your own wiring harness but it is not complicated.
From the existing Lean Burn harness and vacuum tube collection. About the only thing that is carried over is the 12v plus to the coil that is powered on when the ignition key is on.

don’t just scrap out your existing ‘locked’ lean burn distributor. They can be used for ECU control on Fuel Injection systems. I use one to trigger the MS3 Pro FI system in the 68 Barracuda.