1953 f-100 with merc flathead

[flathead 53]

Thinking about going with two carbs and A reworked GM distributor, engine has hedders on it but otherwise stock ,truck has A T-5 trans ,power steering ,and A 9" rear with 350.1 gears from A 59 f-100. what are the advantages of doing this , The truck runs very good as is with no problems , gas milage around town is approx 14 mpg . the merc flathead is A strong runner as is. looking for pros and cons .