340 head bolt question...

Okay, so I'm an idiot. I pulled the heads off my 340 motor last summer to have hardened valve seats put in, after getting the estimate I decided not to and just put them back on. My problem is I didn't label any bolts for puting them back on. I noticed that the new head bolt kits have different lengths and I can't find any information/diagrams showing where they go. Can anyone please help explain where they go? My bad....lesson learned