My preference is OEM parts over repops when possible. If you can find a radiator shop that will boil out your old tank you probably won't even have to coat the inside. Whether you have to coat it depends on the amount of rust on the inside. If there's little to no rust you'll be good to go with just a cleaning. If there's a significant amount of rust you'll need to acid clean it, then coat it. When cleaning/coating I use basically the same process as rustednuts except I use RedKote instead of POR-15. That's not a criticism of POR-15 because I've never used it. Of the several coatings I've used over the years, RedKote is by far the best I've used. My 2¢
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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