what should i do?

[defflepp1]

1994 3.4 Euro 121,000 miles, im replacing the UIM and LIM gaskets, coolant temp sensor, PCV valve. one of the bolts holding down the lower intake is rounded, what would be the safest way of removing it? my thought was to drill it out and use an easy out but I'm worried that might hurt something. also while i have the engine torn down is there anything else i should replace? or what about cleaning the injectors while there out? any input would be greatly appreciated, as I'm a total newb when i comes to tearing an engine down like this let alone LQ1's