Yeah so the point of my ramble I forget to say.To quote perfacar;
"7000 does you nothing on the street."
If you need more power, stroke it.
See 7000 rpm with 3.91s say is about 54mph at the top of first, and then what? Put in second for as long as it takes to lose the race,to 60.
Naw prawbly 90% of the time you will be doing the the start to 35 mph thing. And it's nice to cruize in second at 2800 or less. So that will take oh let's see, I vote 3.73s. These will get you around 32 at 2850. Then when you slam it down one, you will be doing 3944.
So put a cam in there that pulls hard at 3944 and call it a day.
Or just pedal it a bit.
If you need more power, put some nice heads on it, or stroke it,or supercharge it.
BTW to make torque at 3944 takes not much of a cam, in terms of duration. Put some decent heads on it, and a high-lift moderate period cam, instead of the 509; you will have way better street manners and waaaay more fun, and then if you got some extra cash, go find a 3.09 low box, for a very nice 11.52 starter gear.
Oh yeah try to keep the cylinder pressure up in the fun Zone at 150 or better.Even better is 165psi.With aluminum heads you can go to 185, or better.
The big 509cam will make idling around in first with street gears and a 2.66 low awful jumpy. You will be slipping the clutch constantly, a royal PITA.It may get to jumping so bad it will seam like the u-joints are ready to snap. The 3.09low will ease this considerably, as will retarding the idle timing way down.I went to 4.30s(11.44starter gear) to get rid of it, and then a GV to get the hi-way revs down.With the 3.09 low, I could run 3.91s(12.08 starter), but I broke those. With retarded idle timing and the 3.09low, I could run 3.55s(10.97 starter), and have run them almost ever since.
But I just gotta tell ya 7200 into dual 3 inch pipes with Dynomaxers, is tremendously addictive! I'm real glad it only takes a few seconds to hit the speed limit, or I mighta blown it up many times over. Get a rev limiter, for sure, cuz when it starts screaming, the tendency to let her, is right there!..