How about this one:
https://lateral-g.net/forums/show...t=16246&page=7
If you look closely its a reproduction 621 but they casted in the lower mounting pads and bolt holes, to fit the back of an ls engine perfectly. I have the ls7 clutch inside it and the TKO-600. I didnt even have to switch the pilot bearing. The one that came with the engine fit perfect to the pilot. Its not the standard small block/big block, muncie/t-10 pilot bearing. The ID is the same but the OD fits the larger step in the crank and its a sealed bearing. The bell is not a scattershield but will do the job.
I bought my bell through The driven man the guys name is grey. CC would not sell me the bell unless it was part of the kit.
You could go with a quick time or mcleod scattershield also.
Hope this helps some- Rich