I had one as well. I put 160,000 miles and 2 engines on it before a got rid of it. 2.8 litre V6 and 4 speed. It handled really well and could sure surprise a lot hot cars of the time. I don't know how fast it would go since it had one of those 85mph speedometers but you could easily bounce the needle of the post. I don't know if you are going for stock, but if so, the engines were red including the intake and valve covers. Neat finned aluminum valve covers.
Quick internet search results: Chrysler 300B - 353 ci, 218.8 in. overall length and 126 in. wheel base Desoto Adventurer - 341 ci, 220.9 in. overall length and 126 in. wheel base Not a lot of difference.
Actually arrived in yesterdays mail. A Revell 1948 Ford, Testors Honduras Maroon and a set of AMT Firestone Deluxe Champion tires. I ordered them from Mega Hobby on 4/6 and they arrived 4/11. I think that is pretty good service.