Re: 600w vs 90w
The oil and lubricants in a model a are generally highly debated. Some use "600w" some use the modern equivalent. Some use straight STP additive or a mixture of it.
You can likely get away with a thinner lube.
The issues with going too thin will arise when you finally get the car going and the oil is up to operating temperature.
If you are comfortable using a thinner oil then do it, just pay attention to how the car reacts, you will likely notice when it's warm that it will shift different than you are used to. If use notice something is askew change back to some version of a thicker weight oil sooner than later.
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