All the comments about having a rock solid foundation as a starting point are dead on. Here's a link to a very good book that explains all this in good detail along with answering the "why".
https://www.amazon.com/Performance-F...52630633&psc=1
And it covers many aspects of efi. I read it cover to cover several times before beginning my stand alone ecu project, which I detailed in a thread here in the street section of the forum. Whatever system you end up using, follow the advice about solid fundamentals.