Lots of parts! Need help IDing them

That hub/"flywheel thing" appears to be a solid aluminum balancer/damper, but you can't really call it a balancer or damper because it does neither! Engine might rev a little quicker for a while, but it's a good way to break whatever crank you put it on. Gotta have some type of dampening mechanism, like the rubber strip sandwiched between the hub and outer ring on OEM and most aftermarket balancers if you want proper engine life. Some have run them in some specialized applications, but I wouldn't use it if it were free. Good for recycling, doorstop or conversation piece.

B&M flexplate (gold) is a nice piece. just gotta find the part # & application.