top end gaskets and seals

need a little input and information pleas I bought a 76 dodge dart its the sport body I guess not the swinger don't know if the slant 6 is called a sport or just a dart but I had a 73 with a 400 in it but never really turned to many wrenches on a 225 don't know a whole lot about them being younger most of my top end experience is around 95 and up this 225 is another ball game I have a blown head gasket and bought a top end gasket set and man I got a box full figured it would only be intake exhaust valve cover but it lists of course the head gasket intake and exhaust and valve cover but also spark plug tube seal valve stem seal intake and exhaust water outlet air cleaner air injection exhaust flange 2 of those egr valve fuel pump mounting cylinder head cover filler pipe and diverter valve not sure what some of these are but a lot of them are common sense but cylinder head cover filler pipe ? I'm pretty sure I can identify them as I go but since the kit come with all of them I want to replace all of them I have a truck to drive but want to make this a daily driver can I get some advice or is there some tips or tricks to help with a first timer on a 225 or anything to watch for wanted to swap out for a small block but after replacing the coil water pump doing a tune up and adjusting the valves redundantly the motor seems very simple and well organized and built for a shade tree mechanic thanks in advance this is my first post to this site by the way so sorry for the long post and or if I'm in the wrong place