If you would like to see another 190K from that car, it's time for a rebuild. Get these parts...........
Head gasket
kit
Timing belt
Timing belt tensioner
Water Pump
Piston Rings
3 Exhaust Valves
I posted a guide on the head job here.......
http://www.automotiveforums.com/vbul...d.php?t=901427
When the head is off, the oil pan can be dropped and the pistons removed. Hone the cylinders, re-ring the pistons and put it all back together. You will then have a new Metro again and it will cost you less to rebuild the engine than to drive a truck or SUV for a month.