Sorry for not responding sooner. If you're going to display the model with the hood off or open, I would go ahead and wire it up (unless you're entering a box stock category). Model Car Garage makes some excellent photoetch wire looms that would work perfectly and help keep everything neat and tidy. They also make photoetch linkages and machined aluminum AN fittings, and braided stainless steel line should you decide to go all in and detail the heck out of the engine. As for installing the wires, just drill holes in between the manifold tubes and you'll be fine. However, since you said you'd decided not to wire it up, just file this away for future reference. As a contest judge, if this is going to contest, make sure all the ejector pin marks sanded off or filled, especially if the hood is displayed open or off the car. I've bounced many good builds in the first round of judging for failure to do this basic step. I look forward to your build.