1994 Mitsubishi 3000GT Seized engine

My timing belt snapped and my engine seized and I took it to a mechanic that said my valves were messed up and I needed to replace them so I did and it cost me $3,000 for a 24v job and although I paid that and got my car back when I first got my car back and they turned it on white smoke came out and they said it was due to oil getting on the engine and it's burning off which I found some what valid I then drove my car not hard but just average taking it easy and found that white smoke would come out here and there and I asked a friend that was a upcoming mechanic and said that well it's probably because your valves haven't seated right yet but give it a couple hundred miles and you'll be okay so I said okay but then noticed that I was burning oil awfully quick and from there I heard a ticking sound every so often but when I put oil it stopped so I did that every so often when I'd hear a ticking then I told my same friend about it and he said well that doesn't sound good talk to the mechanic maybe the valve job wasn't good and as I was driving home from work a loud ticking started and then my car shutdown/stopped I called for towing the next morning to get It to the mechanic he said that the engine was seized due to lack of oil but that didn't sound right cause I had been putting oil in all the time and when he went to check he said he found about a cup of oil in the engine and that it would need a whole new engine now my question is if the engine seized up from lack of oil could I possibly salvage some parts of the engine that weren't damaged and just replace the parts that were such as bearings, crankshaft, cams, etc. Any help or information you can give me would be much appreciated thank you very much