I’d run a larger vacuum carb. A 600 is smaller than a lo po 440 had. A tq would be good and is what factory 440 trucks had for years. I’d want as much power as I could get when towing. Guys can do what they want, argue this all they want, but a bigger carb doesn’t kill low end like is claimed. The secondary’s will come in as needed. That’s been my experience running a big carb after a small one and the seeing the results.
