Three stages of tightening.
Stage 1 132 in-lbs
Stage 2 30 ft-lbs
Stage 3 An extra 90 degrees
The other big thing is tightening sequence. Looking at the top of the engine the bolts are numbered like this
You want to tighten them in that sequence and remove them in the reverse sequence a half turn at a time. Re-use the head bolts only twice.
You should really get a manual if you're doing stuff like this. My info is from the Haynes book, it's only $20. Money well spent.