Preset gap is .040 if memory serves. I prefer to do engine work with the motor cold, much less likely to burn yourself that way. If the plugs wont come out you can run the motor for a 30 seconds or so to warm the block up, but it doesn't take long.
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You're at 89k and change. Service interval is 100k. Change em.
AC Delco Iridium plugs, part number 41110. Go to rockauto.com, they are already half the price of most other places at $4.58/ea, plus you get $2 off per plug through a mail in rebate.