To convert to gas (pump or race) all you'll need is to swap out the carburetor. Alcohol carbs are set up very differently and use much larger jetting, venturis, power valve set ups, accelerator pumps etc. When running methonal you use more than 2 times the amount of fuel. Hense the larger items listed.
As far as the internals.... they wont know the difference one way or another so they wont have to change unless you are trying to achieve a lower compression to run pump gas. In that case you'll have to know what it is to start. Chances are its probably higher than pump gas yields.
Hope this helps.
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