help with parts ID 408

Howdy all! Finally getting back to my 64 Barracudas 408. I bought a used, running engine, scat crank, scat rods icon pistons with scat crank, all in a late LA 360 that had the factory roller cam. Presumably the cheapest 408 kit that places like summit sell, but want (need) a positive ID on the lower end parts. When I got this thing it came with the later 4speed auto, which I sold separate, and when taking the two apart I found a large nut welded to the torque converter, so red flags were flying. Called the seller and he said "just ignore that" I cant ignore that! I still feel I did OK with the purchase as it also had indy max X magnum heads, the stroker kit, block, hughes rockers etc. Now having it all apart found some other wierdness. So I'm going to take this one step at a time as I re-assemble. What crank do I have? is the flex plate compatible balance wise, and is the balancer correct? Any help is appreciated. Tried looking online but was getting confused

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flex plate and balancer is correct for a external balanced engine, like the 408. At least what I have found...