Looks like you want to ask David aka Lextreme about the available products listed. Not sure of his schedule but a reasonable thing to do is go ahead and post your plans or at least whatever you are willing to share. What is your goal with the project? Is this your first project or have you done any other(s)?
Without knowing your plans I would make a few suggestions: Supercharging is an excellent way to increase power (torque and horsepower). It also increases the load on the pistons, rings, connecting rods, oil system, cooling system and transmission.
In addition to whatever supercharger system... you will also need a means of adding additional fuel and ideally controlling the ingintion timing.
If you are planning on upgrading the engine internals (pistons and or rods) a very good plan is to obtain a second engine and even a transmission. Rebuild that with the upgraded parts. Swap in the upgraded engine. This leaves you with a spare in case something goes wrong and will minimize downtime and maximize fun... which is the reason for crafting and rodding to begin with.
