High 7's in the 1/8..how much weight and power??

skrews said
My 360 made 442 HP on the engine dyno. The car runs 7.5-7.6 in the 1/8. Car has 4.56 gear, 4500 stall 8" verter, 28" slicks, and 3400 race weight. 1.58 60' times. DA in the 2500 ballpark.
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What kind of motor work did you have done if you don’t mind me asking? Thanks!