Resealing M103, what sealants should I buy?

[w123fanman]

I bought a 3.0L M103 several months back that is going into my 190E Sportline LE. It supposedly had a valve job done shortly before the car was wrecked and put into that yard I bought the engine from. I think the headgasket was also recently done and I don't want to mess with that right now unless I have to. I bought a leak down tester to check the health of the engine but if it passes, I'll move on to resealing the engine. I have bought the Elring headgasket kit and am about to order the Elring crankcase seal kit. I have a Victor Reinz crankcase seal kit that I am sending back because my faith in Victor Reinz seals isn't especially high. I have an Elring valve cover gasket as well.

So I plan to replace as many seals as possible, including the front and rear main seal, oil pan gasket,oil filter housing gasket, etc, basically whatever is in the kit and I can identify. The engine will be on an engine stand so It'll be easy to access whatever I need to access. The question is, what sealants do I need to use on this job? I know RTV is not recommended, but I've seen a lot of other ones thrown out there and I'm not sure which is best. I know I need to order the flywheel lock tool in order to replace the front main seal. Any tips for this job will be greatly appreciated.

EDIT: Anything else I should replace while I'm in there? This engine does have 200K on it. I'm not worried about the timing chain but should I do the rails?