As far as the fuel goes , if you are still running a factory GX engine then you'll be ok on regular fuel.Unless you have higher comp. pistons , then it starts getting interesting. Some good machine shops can make a "COPPER" head gasket at the thickness you need for the difference machined off the head, but you may need to supply a stock head gasket for them to go by.And the good thing about that is you can use the copper head gasket over & over again.
Hey Razor , did you read the tech section on swapping to an internal reg. alternator. There is a wire that needs to be cut & hooked together. That is where your problem lies if you didn't make this change.