ALFA ROMEO 8C-2900 A/B SHORT/B LONG
The ultimate - a leftover racing engine (220bhp in the rare A series, 180bhp in Bs) with twin blowers, dry sump lubrication, and magneto transaxle, but you've got the all-independent suspension of the sixes. 120mph no problem with a short-wheelbase B, and lovely bodies on the long chassis, as well. Price? The sky's the limit.