My timing belt snapped on my Chrysler 300m and the engine quit running. on 1999 Chrysler 300M

I had the timing belt replaced along with the pulley and water pump. When it was re-started it ran rough at low rpms but smooth at higher rpms. I checked the compression and I have two dead cylinders on the left side (drivers side)I was told that since the engine is an interference engine, I must have floated the valves and consequently they struck the pistons and bent. How long would it take to repair the left side doing a valve job and how much would it cost. With 150,000 miles should I get a complete valve job on both sides with the head machined and how much would that cost?

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