6 volt or 12 volt

[Standing Elk]

Ok, just got my "new to me" 30 coupe home and am starting to sort some things out on it. What are your opinions on doing a 6 to 12 volt conversion. This car had a non working alternator on it and I have some doubts about the health of the battery. I am anticipating having to replace both the battery and the alternator or generator whether I go 6V or 12V. I see Mac's sells a 6 to 12 volt conversion kit that includes a new 12 volt alternator, light bulbs, rectifier, new 12 volt coil, and a starter field coil. Has anyone used one of these kits from Mac'c? It appears to include everything needed to do a complete conversion. Also looks like nothing would be altered to the point of not being able to go back to 6V if you wanted to. Anyway just curious as what opinions I could get. Thanks