Heavy or lightweight flywheel?

For a streeter
it really depends on your starter gear, and your engine's torque down low.
With say the regular 2.66 low A833 and 3.23s your starter is 8.59. With a low-torque engine, taking off with just 8.59 takes a bit clutch work. So a light flywheel will lose rpm and be a lil herky-jerky.

With same trans and 4.10s, your starter is now 10.91, or 28% better, and taking off is less of a chore. So now you can use that lightweight FW.

Butum, I have a hi-torque 360 with a 3.09 low Commando trans and 3.55s for a starter of 10.97, and I have a factory-stock heavy FW.
What I do is, with the trans in first, but not yet engaged, I blip the throttle just a lil, then more or less dump the clutch, letting the heavy FW dump it's energy into "launching" the car.
The heavy FW also smooths the lumpy idle.
And it allows the engine to pull the car along at 550 rpm on flat,level,hard ground, at 4 mph, which for me is must-have. It will pull down to 500rpm/3.6mph, if I need it to.
Try that with a lightweight FW.