Installing a Kill Switch

[66 Racer]

Hey,

Well, I want to put a kill switch in my stang, but i was wondering what the best wire would be to kill, and where is the best spot to get it into the car, I dont want to have to drill another hole. I had a switch on the car a few weeks ago, but thought i would get any advice from you guys that I might not have thought of. Im also thinking of just keeping the switch under the hood and locking it. I basically want the kill switch for peace of mind, and so that on these HOT summer days i can keep the windows open if im making a quick stop at a store or mall.

Thanks

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Under Construction 66 Coupe
-289 V8 - 600cfm Holley -Tri-Y Headers - Flowmaster 2.5 dual exaust, Centerforce Clutch