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Re: GMC V-12 powered '91 Chev crewcab
That thing is going to have an awesome sounding idle. I bet with full exhaust and a good tune, it will be smooth as silk at less than 400 rpm. Sounds pretty responsive for having a crankshaft & flywheel that weighs more than some of today's complete engines!
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'68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD 
'72 K20 500 Cad/TH400/NP205 SOLD
'92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver
'72 Monte Carlo... sweet low mile toy
'11 Dodge Challenger IE 392 6spd... midlife car 
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