Best fuel injection ?

It is REALLY difficult to say, "best."

1...What is your budget and there is ALWAYS unforseen "headroom"
2....Do you think you might upgrade later, AKA go from TBI to port injection? If so, consider a Holley system which uses the external "HP" series computer. This can handle TBI, you can later disconnect/ remove the TBI injectors and use the same TB for your port injection, just an example

3...What is your talent with computers and do you think you can tune it yourself.......because paying others to do tuning/ fuel/ timing maps will add up fast.

4...You going to wire it yourself? You must be pretty careful not to invoke EMI/RFI problems with modern electronics.