next step air fuel ratio meter or

Over carbing is a myth, if you tune a carb to perfection, then it will work. A 750 is not too big for a 360, in fact, I know of people who run 850 carbs on built 360's. Actually a 650 might be too small for a 360.

As for the fuel line, I agree, stock is too small, buy the Summit fuel line kit #6, it has what you need for about $80. Also, I have an A/F meter that I ran on my old Dakota, I am selling it, but I have a buyer that is supposed to pay me today for it, I will let you know if he does not come through.