Any PTFE paste will work on head screw #11 - Hell, I've been using Harvey's Pipe Dope without any trouble.
I refer to numbers because that's how I know them. LocTite #272 is a "high heat" version formulated specifically for exhaust use - your parts guy should know what you're talking about if you go that far. Last time I needed the stuff, I went to an MRO house for it. Anything else will break down under exhaust heat, and won't do you any good at all after about three days.
Ditto the RTV copper (thin layer!) on both sides of the manifold gasket - he probably picked that tip up from me, and I've been doing it for the best part of thirty years (especially on inline sixes with aluminum intakes and iron exhausts on the same side of the head. It's less of an issue with iron/iron, or with "cross-draft" heads.)
@indy - bear in mind that LocTite is a threadlocker, and not a sealant. Any sealing properties that your red loctite would have are accidental at best, and you can count yourself lucky. Also, the reason that #11 gets torqued to a lower value is due to the lubricity of the PTFE paste - if you use it on anything else (like water pump or thermostat housing screws,) lower the "clean, dry" torque spec by 10% as well - same reason. RTV and LocTite threadlocker does not require a change to the "clean, dry" torque spec.