The first thing you need to know is what jet you have in the engine now. Going from gas to alky, the jet needs to be in the neighborhood of twice the "area" of the gas jet. Pi()RSq. is the formula for calculating the area of a jet. For instance, a .055" jet is 98.8% bigger than a .039" jet. If you don't have a set of numbered pin gauges, either buy a set off of eBay or find someone who does have them. They sell pin gauges in sets. The one you want is .011" to .060". (.011, .012, .013, etc. etc.) The Chinese sets are fine for your purpose.
Be aware that the difference in area, (flow) between a .049" and a .050" jet is 4.1%. Also be aware that the "air density" in your area, (it changes with the temperature and the barometric pressure.) changes daily, and from hour to hour.
From the desk of Al Nunley
Comments compliments criticisms and questions always welcome.
If the data does not support the theory, get a new theory.(Al Nunley