[73T/A]

As mentioned earlier both of the Pete McCarthy’s books show to different cams for GTO with manual transmission.

[Kenth]

There are actually 3 different camshafts for the 1970 M/T and A/T GTO engines.
067 for 350 hp. STD.
068 for 366 hp. RAIII.
041 for 370 hp. RAIV.

FWIW

[unruhjonny]

Originally Posted by 73T/A

As mentioned earlier both of the Pete McCarthy’s books show to different cams for GTO with manual transmission.

Just circling back to this, because I am earnestly trying to help, and to clear up any confusion.

It appears as though your images are all from Pete's 'Racer's handbook';
This book was printed in 1981 - I have a copy of that one too, but rarely reference to it because I don't bracket race.

This book you are citing obviously has errors.

I shared images from the 1970 Pontiac service manual and Pete McCarthy's "bible" - both show the 068 was the L74 cam only.

If it matters, my book "Musclecar Performance 1955-1979" has a print date of 1989, and is the third printing of the fifth edition.

Also, we need to understand that authors make errors.
Just because you can find a print source, doesn't mean that it's fact.
Even model year (pre-production) literature can have errors.

For the 1970 model year:
L78 = 067
L74 = 068

period.