I have a 390 in my 79 bronco and it is using a lot of oil. I checked the compression and it turned out good. It also has good oil pressure. It has around 90000 miles on a professional rebuild. It smokes when warm when you first start it but not while driving. I think it needs valve seals but why is it using so much oil. I would say it uses a quart around 800 to 1000 miles. Is it the valve seals or something else? It has all the power it ever had. Any ideas?