I'd like to suggest Morgan, here represented by a 1986 +8.
Technical design from the 30's, wooden subframe, about 940 kg / 2070 lb, outer doorhandles are optional extra, the chassis is part of the suspension which is rock hard.
Even the smallest engines, a 1.6 litre Ford unit, makes this car more than able to keep up with modern fast traffic. The 3.5 or 3.9 litre Rover engine makes the Morgan behave like a vintage dragster, and the newest 3 litre Ford V6 is even more powerful.
Few other cars are faster measured in smiles per hour.