Lightweight flywheel options and selection criteria.

Well, I am 100% sure that I would NOT run a lightweigt flywheel in your combo.
If yur gonna run that combo on the street, Yur gonna find out a few things real quick;
1) those 3.55s are gonna suck, and
2) you'll be begging for a big fat heavy flywheel, and
3) you just cannot idle it down slow enough in First gear, to not have to be slipping the clutch all the time.
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With a regular A833/3.55s each 100rpm is .85mph, so 850 rpm is gonna be ~7.22mph, and every powerstroke is gonna telegraph straight into the chassis, and straight up the steering column.
Parading is absolutely never gonna happen with that combo.
Therefore;
I recommend the heaviest doggone flywheel you can find, and a Commando 3.09 low, and then the 3.55s might be bearable; this will get you 850rpm @6.2 mph, but still not parading. To get to 4 mph@850, will take a 5.5x gear
To get to 450hp with an iron-headed 340 means a cam of about 292 or more duration, right? Yeah I ran 4.88s with that, lol, for a starter gear of 266x4.88=12.08 and to get to 4mph, the idle was cranked down to 650, any slower and the 292 cam began bucking, even with a factory heavy flywheel. I eventually got that cam down to 550, but that was a chore! and how long do you want to parade down low like that?
So, with a cam like that, (mine was 248/249 @050), and a manual trans, in all honesty, parading was out. I pulled the cam.
IMO
450 hp on the street with a 4speed; been there/done that/never going back. and my car is/was ~3650 with me in it. and,
BTW, 3.55s is my gear of choice because 1.92Second gear takes me from 3000@35mph, to 6000@70mph, almost perfect for a nearly 100% street-driven car.
Obviously, your application is slightly different, lol.

But, yakno; you can change a flywheel out in about an hour, lol; and not much longer to swap out the rear. So, we, or maybe just me, are making much ado about nothing.