Hopeing this is the correct forum for this subjec> Ive been searching high and low but I have not come up with any info on the general locations of holes in the firewall. I do realize and know the common stuff but there seems to be extra holes in places and before i go welding up stuff id like to know of they are add ons or not.
Here is a little back ground,
68 442
hardtop
bigblock
4 speed manual
Non a/c
does have heat though
non power brake
I do plan on adding the rally pack gauge set.
any picks or ideas would help my diagram I'm making. Matt


Drivers side

 

If you start with the Assembly Manual (PIM) Section 0 pages 140 & 141 you can see what was supposed to be there. Section 1-2 is also helpful

 

This makes some sense now . I see where Inline tube got their picture from Just wish I had the whole thing as pictured was in the PIM
, But it is a start thanks for the info

 

I sell an excellent copy of the 68 A-body PIM if your interested.

 

I don't see a whole lot of extra holes. Keep in mind that you have holes for the speedo cable, the heater wire harness, the "christmas tree" fasteners that retain the sound deadener pad, the voltage regulator, the accelerator pedal mount, the accelerator cable, and a lot of sheet metal screws that go through the firewall.