It’s probably not a big deal but unless you can find someone who has your exact chassis and has converted it to a 4 stroke you will have to check it out for yourself. I’ve found that most 2 cycle sprint chassis can be made to work fairly easily. With a 15 deg mount and the small sprockets usually run on modern sprint tracks clearances that you think will be impossible are often not a problem.
I documented the process with an older CRG chassis on my website, it will be the same for you. Again, I have to stress that you probably won’t know if it will “work” for your kart until you bolt the engine onto your frame.