3.91s in my 340 now!

27" tire, 4.10, almost 4k rpm at 70mph. I think a gear vendors od is called for. And probably some sound deadening material in the floor, doors and roof. I'll eat the weight, it's more than made up for in the aluminum intake manifold alone.
4.10s? Wow! Funny, but at highway speeds (60mph or so for me) the "noise" factor is very tolerable. Now, if I had cut-outs, that would probably be a different story.