Dual-port 1600 with dual 40mm Solexes and extractor exhaust. With 215-15s on the back it topped out at 85, but it would top the summit of the Coast Range [empty] at 70.
I was at a traffic light on Franklin Blvd right in front of the U of O with a fully leaded 1952 Ford pickup behind me on a tow rope. There was a Mustang in the other lane, and I forgot the pickup was there. Snapped the tow rope.
The portal axles gave it a great 60-ft time. Thanks for asking.