This is the one I bought for my folk's car...
https://www.summitracing.com/parts/sne-550-516
The engine is a .040" over ATK 454, .100" dome pistons, hyd roller, fully CNC'd AFR 265s.
The system I bought says good to 650 HP, will be more than adequate for their 454. I estimate their engine around 550-575 @ the flywheel.