So 40 extra pounds makes such a huge difference eh? Tell us Duster Dave, how much of a difference? Or should I already know that too??

My duster has always had a cast iron headed small block and yet it leaves hard with better than avg. 60ft.s. 40lbs. off the front end, all things being equal would not equate to very much if anything. But the 20-30 extra HP our Iron heads make over OOTB eddys would definitely amount to a very noticeable difference.
But I'm sure you already knew that!

Gotta love the internet smart a$$e$