Given the size & weight of the Escalade, I feel they would get better results (i.e. much more bottom & midrange power) out of a positive displacement blower such as a Magnacharger or Whipple.
The big heavy Escalade will leave a lot harder and "feel" a lot faster with a positive displacement blower as you won't have to wind it up as you will with a Procharger to start making the power.
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
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