[WhiteCST]

First off, that’s awesome he just gave it to you. Hard to beat a 5.3/6.0 with a 4l80e combo. Good power and torque stock DIRT cheap. Not to mention can handle pretty high boost reliably so running lower boost would be no problem. You could probably get motor and trans for less than or slightly more than the blueprint motor (especially if you go 5.3) leaving lots of budget for the drop and any interior or bodywork it needs. You mention the 4lxxx series being difficult but paired with the engine and computer it was meant to be with, it doesn’t take much to get it going. I’ve read accounts of highway mileage being between 20 and 25 with 3.73 gear. Just my .02!