I long ago rerouted my slant's fuel line to be clear of the hot stuff in the engine bay. Routing it well also makes pulling the valve cover easier.

Be very careful of temperature readings from your "lazer". That laser spot is just an indicator, not part of the measurement, and may or may not be where that sensor is looking. Most of those gun-type infrared temp gauges are not adjustable for emissivity or reflected energy, either.

Here are a couple of thermal images of a running slant. White is hot, black is cold. The exhaust manifold surface temperature in these shots peaks out at about 331F.