318 intakes - old style?

I vote to run it stock first with an improved distributor curve and then switch to an Offy 318 dual port or an Edelbrock StreetMasterwith a 1901 AVS2 just to see what kind of mileage difference you get. I think it would be better than expected even with the restrictive stock Y pipe and exhaust. Is this going into the slant six truck?