Go to your local pic-a-part a look for a 96 and up 3/4 ton suburban. some of them came with 454's. They were GEN VI at that point. When the great minds at GM decided to retool the mark IV 454 the GEN V was born. The GEN VI is a great foundation for a killer bigblock powerplant. I have one in my 85 and it has killer low end torque. Stick a big hydraulic roller cam in it and clean up the heads just a little and be ready to be impressed. Mine has a th400 w/a 3800 stall converter, and 4:56 gears so it's even more of a monster. But one things for sure, do your research before you lay out the green.
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