Point gap would be the same as a gasoline burner. But why mess with points? Ihave a LP fueled C-II gleaner with the G-262 Power Unit., Same engine as a D-19. I install a Pertronix electronic ignition system in the distributor and I have not looked back. An far as plug gap I would run a .025 inch or a .005 inch narrower than the gasoline model. You will also need a colder plug than the gasoline model. That said I do not know what plug gap my G-262 is running as I have not had the plugs out in the 12 years I have owned the combind. This is one of the beauties of LP Motor Fuel. A little payback for not being able to fuel your machine with a 5 gallon rusty bucket.