The guy is dreaming for 318fwhp from stock parts in my opinion, trickery or not, keeps the followers going I guess.
Back in 1980 I bought a good running all steel full interior street/strip '71 340 Cuda, 10:1, 2.02 stock heads, ally intake, 750DP, hdrs, .484/284 cam, 3.55's 8x26" slicks and a 3500 stall B&M s/holeshot converter. The car hooked real well on its stock L/springs and snubber, would lift a wheel and ran a best of 13.28@101, put that into your calcs at around 3500 minimum with me and it comes out to 301fwhp with all ancillaries even allowing for some variations and yu reckon he'll get more with much less:realcrazy: