considering this is your car (and reading as much as you do to it) I think it would be okay to make a cross country trip. You may want to map a network of dealers close to the main roads youre taking, or find euro parts houses that are on your route, but knowing this is YOUR car, which I know you rebuilt many things on, I'd say, go for it.

I take the work horse everywhere, 230K miles and she never left me on the side of the road.

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91 350SD
14 F150 Eco
19 Fusion Hybrid
11 GT500