From my career in the oilfield, I say absolutely. Hydrocarbons are hydrocarbons.  We never changed anything out when the wells would produce gases as opposed to liquids.  As always, be safe with flammables and test your assembly with air pressure.  An easy and proper test would be to screw a pressure gauge into one end, and a Schrader "tank valve" (available on Amazon) on the other end.  Use a bicycle pump to put some pressure in the assembly, remove pump, and write down the pressure.  Check pressure after a few hours.  If you lost pressure, you have a leak.  Leaks can be located with a soapy water solution in a spray bottle.  Have fun, be safe, and always wear eye protection and other PPE (chemical gloves, etc.) 

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When repurposing a propane torch valve for use with gasoline, it is important to consider the compatibility of the existing seals with gasoline. While petroleum gaskets are generally designed to withstand exposure to various petroleum-based fuels, it is essential to verify if the specific gaskets used in the propane torch valve are suitable for use with gasoline. 

The composition and quality of gaskets can vary across different manufacturers and products. To ensure safety and prevent potential leaks or damage, it is recommended to consult the manufacturer of the propane torch valve or seek expert advice regarding the compatibility of the existing seals with gasoline.