No Larry the rear tail is taperes and unique where it qwelded to the rear cross brace.
The frame rail  has an inside box that ends  on the inside about 1/2 way between the  last side body mount and the rear tail mount.
The Manual deplict 148.62 Wagons/pickups and 145.35 sedans,coups & conv. This is from the front frame D point.
So you have to remove  3.27 in or 3 17/64 "
 So frist do a cut  straight accross both inside and outside  frame rails 3 17/64 toward the front, measured from the  end of the  inside tail sections channel.
remove the inside channel from the tail rails.
measure 3 17/64 on the outside rail towards the front.  wizz off the channel welds an top meterial of the outside  C rail. and then cut the vertial remove this peice and dress the area for welding.
With the info given in the manual it's easy with a level site to make spacers  to position the frame verticial from the datum line and with pipes in the body locating/positioning. holes, X  measure to the newly instaled rear section for squareness B-4 you  weld.
 
GL Wayne
 
Wayne 
I
----- Original Message -----
Sent: Sunday, September 22, 2002 9:14 PM
Subject: Re: [Chevelle-List] 66 Chevelle SS frame question

Wayne:
I will have to look in the shop manual. I thought the 3.17 inches could be cut right off the back? Am I not correct? Oh well it ain't happening for a while any way.
                                                      Larry (z)

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