No I don't think so. The heavier fw would possibly make it smoother but would hurt acceleration around town and possibly impact town fuel economy too. In any case the 28# fw works fine for the 240 so no reason not to get one and sell off the 38# fw to someone doing a 617 turbo swap.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.