Good luck on getting the original tank! I restoed my 1970 300S 5 years ago and found a tank, but two years ago I was doing one with my nephew and they were getting rare. The plastic would rot in the sun and then crack from the pressure inside. The 300 did not come with a mudflap, but was an op...
I have a 1968 DPL and it looks great with 15" Cragar SS rims on it. I also put coil over shocks on the back for a small rake. Cooper Cobra tires. If this has the factory BW tranny, be careful doing your burnouts, they are notoriusly weak.
Let my Cameron go...