If you want to gain some advantage in going electronic over points the the 123 Tune is the way to go. You can use a simple electronic conversion if all you want to to save the trouble of setting points and replacing them. But that is the only advantage they have.
The 123Tune will allow you to set the ignition curve to the optimum for your engine and the fuel you use giving best performance and fuel consumption
https://www.classicswede.co.uk/123tu..._18276087.aspx
For a 4 branch manifold a great stainless option is
https://www.classicswede.co.uk/B18B2..._13110638.aspx
Made in stainless so will last, optimised flow and in a 4-2-1 configuration for improved torque.
If you want a cheap and cheerful one then use the Simons 4-1 but it is mild steel and really only sort of giving top end power.