Keg intake to 4 bbl m1 intake

“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.
VE means volumetric efficiency obd swap is too much of a can of worms for me, I'll throw in a better cam and call it good