[Cobra 29]

I have determined two locations for my MSD 6 box. One is on top of the passengers footwell and the other is on passengers side of firewall behind the dash on the passenger side of the car. Whci should I choose? The location on top of the footwell is in the engine compartment and much easier to access wiring points and shorter wire runs. The downside may be the heat from the engine. I do have the alumimum heat shields around the header pipes to help reduce heat to the footboxes. The inside the car / under the dash location would be cooler but more difficult to mount (not too many smooth locations) and to wire and swap out if needed. Which location should I select?