Which generation Efi ? OBD1 or 2? Can't decide

Have you looked, into Mega squirt?... If you don't need, smog inspections .... A different ,choice...
I realize the ease and expense of going with the 92-95 or so era. I also realize that from what I've read, have more tunable system with the 96-up 5.9. Who besides Hotwire make a 5.9 plug n play for my 73 A body? Decisions decisions.