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I think you are right on track do they make a Hydra Rev for the LS1 I am snapping Valve springs. I will be installing CC 918 next week.
I dont see why they wouldnt work.  This is from there catalog:
 Description  Part Number 
 Small Block Chevy* w/factory lifters 6155 
 
 Small Block Chevy* w/Seal Power or Speed Pro style lifters 6150**
 
 Chevy* Sm. Blk. w/factory lifters & twisted wedge heads 6156
 
 Chevy* Sm. Blk. w/twisted wedge heads & Seal Power or Speed  Pro style lifters 6151**
 
 V6 Chevy* w/factory lifters 6157
 
V6 Chevy* w/Seal Power or Speed Pro style lifters 6152**
 
Hydra-Rev Kit Installation Tool 6158
 
* Except the cast iron LT1 Impala,Vortec truck heads, ProAction Iron Lightning or         Dart Iron Eagle.
**Will not fit Crane or Lunati Lifters
all right around $240, and they claim some wild hp gains from 6200 up.  Perfect for the LS1.