you can run a 55 shot bone stock with the exception of the colder plugs.

if you bump up to a 65/75 shot, you need to retard the timing and seriously consider an aftermarket fuel pump to safeguard against running lean. i've heard of people running up to a 75 shot on a stock fuel pump, but i personally wouldn't want to risk it.

another option on mounting the zex CPU is on the plastic battery cover. drill some holes in the side of the battery cover to match up to the mounting holes on the CPU box and then secure the box with a couple of zip ties and you're good to go. this setup is going on two years in my car without a problem.

let me know if you have any other questions.