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Get a Heavy Duty Cole Hersee switch. You can mount one through firewall so you can turn on and off without lifting the hood.

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I second BigKev's recommendation of getting a heavy duty Cole-Hersee switch and mounting it so you can operate it without lifting the hood. Here is one such heavy duty switch but they have other variations too. The maximum amp capacity is the important spec for 6v. Typical 12v switches have much lower amp ratings. Ebay vendors and sometimes Napa or Amazon carries Cole-Hersee.




Your body is very similar to the later models so you may also have an unused punch out location just to the side of the emergency brake mechanism. I used that location to mount my switch but if you don't have a punch out maybe there is space to make a hole. Not wanting to bend down and flip the lever I went a step farther and made a bracket, shaft and adapter to extend things so I could mount a knob next to and behind the emergency brake handle.
















Electrically the ground side was interrupted but rather than run a long ground back up to the original connection location at the front of the block I used a shorter cable and connected to a bolt closer to the starter.

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And that should be mounted on the ground side, correct? So it'll be ground post -> switch at firewall -> somewhere on the engine block?

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I personally recommend the ground side. If you interrupt the hot side and ground is still connected a dropped or misplaced tool near the battery and hold down or the cutoff switch could hit the hot terminal and any nearby metal to still cause damage. If the ground side is open there is nothing the tool could hit that would likely cause a problem other than directly across the other battery or switch terminal. Of course any aftermarket items that needed a constant "keep memory alive" power if fed directly from a pigtail on the battery terminal or cutoff switch would have to be taken into consideration if the ground is interrupted.