Using oil issue

Well the 65 barracuda with 273 is up and running and being driven on a fairly frequent basis. I was told when I bought it almost 5 years ago that motor was rebuilt 4000 miles before I got it. During restoration the top and bottom of engine were opened up and all parts looked very new and was put right back together. That was before the 4.5 year total restore was complete which is now about time. The car turned out awesome in appearance but it is using a qt of oil around every 100 miles. I will post a pic with this for all to see. But back to the oil issue What is any and all possibilities causing this

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