Monster LT1-S if they have the flywheel you need. I do not know if they do anything for big blocks, but I loved this clutch behind my LS-based engine. Uses GM disks and pressure plate from the C7 LT1, has the holding power you need, and is a very smooth stock-like feel. I never had a problem with it at all.
https://monsterclutches.com/twin-lt1s-street-gto-clutch
That isn't the exact setup you need, but it's where to start looking. Give them a call to see if they have what you need.