#'s Matching 340 build

'69. J.Rob
if you had a choice which manifold of these 2 would you use for getting the best power and fuel mileage ? fully ported air gap or a stock 1970 iron manifold . interested because i'm building a numbers matching 340 for my car . had enough of the go fast crap , just want a reliable engine for my 100mile+ daily drives .
thanks