Eagle Crank rated up to 400hp?
Another consideration is these days we are making more power than ever before, so what worked 10 years ago might not today given all the extra power.
6-7 years ago the fastest NA Impala was a solid roller LT4 398 with FAST, a TH400, 5 gallon fuel cell, etc. a RACE car, ran 11.50. These days my car runs 11.56 in OK but not great air with so much "less" into the build. With time power levels change.
Heck I remember the first heads/cam nitrous car into the 11s, these days such a setup should be 10s.
A good machinist makes a huge difference too. Have to remember before the aftermarket was so big a LOT of race builders were based on carefully prepared factory parts. You CAN polish a turd to some degree, Mythbusters even proved it.
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