hello to you first i would go for the V3 main board with the extra stuff

for the engine you will need to buy: EFI manifold (complet) + head or adaptor plate at least 300cc injectors but it will depand on the power that you whant for the ignition you would need to buy the CPS and sierra 1800 engine pully

about the sensors the MS can drive all type of sensors but the EFI manifold comes with them so you dont need to worry

hope i helped you