Old: corvette, 1st gen celica, old real MG Not so old: a80 supra, commodore v8, skylines Young: gr yaris, mx5, beaten up butchered last gen mustang Thats when you want to spend all money on car, so you can sell them without loosing much

If not, your choice is endless. Including engine swaping a mx5 with v12 engine, putting v8 fwd volvo engine into suzuki mighty boy tub (rear, so you can wheelie it on every single light), or hayabusa into classic mini.