New build A833 18 spline with Gear Vendors OD.

I still have the Heavy rebalanced 340 flywheel on my 367, and I love it. With a 10.97 starter gear, she's a blip-it-and-go deal, and that heavy beast keeps it idling across/around the parking lot, at 550rpm= 4mph, with a 230cam . Some days down to [email protected], lol.
For me; how fast it revs is meaningless cuz at WOT, this 367 spins the tires to any speed limit in the province. What I mean is that with spinning tires, the Rs flash to 7000/7200, and just stay there until I lift, usually 65mph.
How long the engine takes to return to idle, is of no consequence to me; and not really a good thing if compression braking locks the back tires up, which is partly why the car wears 295s.
Many years ago, I had contemplated a lightweight Flywheel, but put it on the back-burner. Never been sorry about that decision.

I'll be waiting to see how you like it.

As for that front boss, I didn't need it anyway and was pretty sure the GV was gonna stay in my car forever, so I sliced it off and prettied it up a lil.
I used the rear mount, and also moved the entire shifter some 7 inches back between the buckets, and over to my thigh. I haven't missed a shift in the 20 years since.