Low Power / Performance on 91 1.6 Carb Sportrack


can anyone help me, having spent alot of time tweaking the above vehicle I am still suffering low performance and high fuel consumption. I have also noticed that I am consuming oil at a high level, with no leaks apparent. I am getting 165lbs compression on all 4 but am now considering doing an engine overhaul, can anyone suggest a good source for rings, gaskets and shells etc. All parts will have to be mailed as i live in Cyprus where all parts are very very expensive.