No, its not an e-body ...

Here's what I ran into putting the Lakewood in my '69 'runner:

1) Will hit the firewall flange/seam when the engine twists under acceleration - not a big deal, hammer the seam over or trim it.

2) The z-bar lines up decent BUT the arm closest to the bell had to be cut off and moved closer to the frame and the tube had to be shortened.

Ground clearance is only reduced by about an inch versus stock - due to the flange.
Test-fit your headers before you install the motor and grind the bell where necessary. This should not be an issue with tech inspections as it seems grinding, cutting or burning holes in these things is quite common with racers (from what I've seen at swapmeets!)