Of course, if you want to place an obstruction in front of your Datsun, you could power it with a mild improvement.
It's based on a late 1955 Victa lawnmower engine & runs a Tillotsen carb from a Silhl chainsaw. It has many more modifications than meet the eye & I built it for my Deckson minibike.
Or if you want something with a bit more pep.
This one is based on a 1957 or '58 Victa 'Special 18' lawnmower engine & runs dual Tillotsens with MASSIVE ports, a reed valve & the good old Sunday wake up call, a megaphone exhaust.
Both run Victa high comp race heads but this engine is the full on flat out, balls to the wall, grenade race engine.
When the mowing gets tough, the tough get mowing.