Fastest I have driven was 150 (calculated with math) in my old 66 Chevelle SS 396, on 205-75-14 white walls. I was on a long downhill it wouldn't do that speed on a flat highway. A stock 325hp 396, in a Chevelle SS really isn't a very fast car.
Fastest would be about 140-145 (calculated with math and visuals) in my 1993 Dodge Ram (the OLD old square box style) that had a small 318. It was modified, but only bolt-ons including long tube headers dumped through a couple glasspacks, tuned pcm, underdrive pulleys, air intake, and weight reduction. Other than that the engine internals were all stock. Also helped along by a long downhill, and still had more to go but it literally felt like the fenders and other panels were about to fly off the truck so I let off.
2nd fastest would be my 2012 Dodge Avenger hitting 120, but only because it was stopped there by the stupid computer
Once I get my 1320 the fastest I'll hit will be whatever it can get to in 1320 feet at the local track. Of course, if one day I just happen to be in Mexico....