Since we're talking about MPFI manifolds, and EFI in general...
Let's discuss options...
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I have my own ideas, as how to handle the electronics for the MPFI, but there may be better ways.

Cheapest MPFI to adapt to A series engines?

Easiest MPFI to adapt to A series engines?

Most tunable MPFI to adapt to A series engines?

Most reliable MPFI to adapt to A series engines?

Issues? MPFI manifolds for a series engines are somewhat rare.
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Cheapest TBI to adapt to A series engines?

Easiest TBI to adapt to A series engines?

Most tunable TBI to adapt to A series engines?

Most reliable TBI to adapt to A series engines?

Issues? TBI isn't as good as MPFI ( but still better than a carburettor )