Majestic is telling it like it is.....they're just rings. What size are your lines now. The twelves that your planning on running should be pleanty large. I'm using -10's on mine. I'm draining into my oil pan but I've got the drain in the main cap area to try and avoid the oil slinging off the crank...not like I should have to worry about it.....the drain is also above the tray.. Hope this helps. But I seriously doubt that you need to rebuild them.
Just my two cents.
Hey.....what's the status of your car? I thought the last time I talked to you, you were thinking about yanking the blow through off and going injected.
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1968 Camaro SS
Twin Turbo 383 
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