383 Combo Suggestions

At your elevation, practically in the water, low12s should be easy. At 3400#Wet, you only need about 350hp.And the 388 combo you detailed should get you there.
Getting the 60fts down, is not so easy and you could see .4 to .7 second lost on the launch, which could take another 20 to 40hp to compensate for, depending on just how slow the 60ft actually is. But even then, worst case is ~390 hp.
.............. but IMO,that 9.5Scr is gonna handicap you.My best advice is to jack the pressure up waaay higher than you think it needs. At just 9.5Scr, with alloy heads , IMO, yur leaving a lot of power untapped. With more cylinder pressure, you shouldn't need the 3800, which might, if it matters, make a sweeter streeter.
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Just for comparison;
My 3.58 stroke Eddy-headed 360 has happily burned E87 at up to 185psi, the highest I tried. This combo (see Sig,below) went 93 in the Eighth, which the Wallace Calculator translates to 115 in the quarter, which translates to from 12.0 to 12.6 depending on the 60ft, mine was 2.4x, on rollerskates, and lousy starter box.