Southpark

I am looking at buying a used 2003 EJ25 engine with 73,000 miles. It is complete with all accessories including a/c compressor, alternator, p/s pump etc. The engine has already been pulled and freshened up by the shop I am thinking of buying it from. Work done by them are - new oem cam and crank seals, one new double bearing idler, timing belt and one new head gasket. Yes, only one head gasket. Apparently, one "bank" of cylinders had 2 bent valves. This supposedly has been fixed and now in good working order. I am still waiting to hear back from them about the exact cause of the bent valves and what other items may have been damaged(ie - pistons, block, etc.) Can an engine with bent valves be repaired back to a reliable engine? Or should I walk away? Many thanks!