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As long as your gearing is tall enough that you can keep the larger engine near 100% load, it should work.
Diesel have three major advantages, one of which you can offset.
First is that diesel fuel has (I believe) around 15% more energy per gallon, nothing you can do about that. A gallon of diesel will always take you farther down the road.
Second is that diesels have much higher compression, which improves efficiency a lot.
Third is that diesels have no throttle plate, which means no vacuum losses. You can mitigate this in a gas engine with tall gearing which keeps vacuum very low. If you can’t get tall enough gearing to do that, you should downsize the engine a little, to get load higher.
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