I have a motorplate, 2.25" TTI headers, and Indy tall cast aluminum covers. Mine sits in what has to be the stock location b/c the headers have VERY LITTLE wiggle room. I have no heater/blower motor to deal with.
I had to clearance the pass. inner fender under the shock mount for valve cover clearance. I used heat and a BFH.

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CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax