Need some torque specs

I have a verticle V-Twin 20 HP. Model # 351777-0036-01. It was pushing raw gas out of the carb and running only on 1 cyl. It's got a lot of hard hrs. on it so I pulled the heads. Nothing definitive but I'm doing a valve job. It's ready to go back together and I need the head bolt torque if possible. It has the thin metal head gaskets and since there was no damage or kinks in them I'm going to clean them up and use copper coat gasket sealer. the stem seals will be replaced and I'll make my own rocker gaskets.

Regards,

FarmGeezer