Auto to Manual Pedal conversion

I have a 68 Barracuda currently running auto...Looking at trying to fit a hydraulic clutch set up in it...Ive looked at the service manual but its not super clear for my model...does the clutch pedal slip into the same box as the brake pedal or do I have to change all that? Im an Aussie and it looks way more straight forward on our Valiants

Any advice on this would be appreciated

I`d think the auto brake pedal would be too wide and offset to add a clutch pedal .
If I read this right !