What color is the interior? Some colors don't go together too well. My personal favorite is silver but I would stick with the original color or very close to it unless you're going to strip the entire car down and have every inch of it repainted inside and out. Otherwise it won't look right.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k