Keg intake to 4 bbl m1 intake

I want it to run more efficiently ve wise, and have a little more pep 0-60, while keeping my obd1

“More efficiently ve wise”
Not even sure what that means.
You are not going to get any more efficiency with anything other than the factory efi. I like the obd2 better than obd1 but only for its tuneability. For a little more grunt 0-60 a small cam and springs and the rpm Hughes intake and you’ll be there.