i have found that a rebuild to stock can yield impressive results from an inline 6. this might be because they don't give up easily
.and yes, my experience with the drums being inadequate was back in 1980, i shudder to think of it today.
you might consider a mild upgrade of the camshaft, as well as the timing gear set and chain. my old dart had a worn-out timing set at just under 100K miles, and that is something you would definitely want. as to the oil pump, you will find that there is stock, and aftermarket upgrades. for the type of use you are describing, i would stick with stock, because if you need to service the pump later down the road, you will have to remove the engine to do so. the oil pump is actually serviceable, and don't forget that bypass valve.
i would also urge you to consider a valve cover gasket from realgasket.com, because they work better and are reusable silicone gaskets. they ain't cheap, but i found it to be money well spent. remflex makes a really good intake/ exhaust manifold gasket that is also more forgiving than the standard issue ones. they come with a 6 month guarantee, but again, are not at all cheap. you might wait to see whether or not you have problems with sealing, others may feel differently.
best of all, if you like to sometimes turn your own wrenches (or just want to have a better understanding of do's and don'ts), you should shop for three books. Petersen's Basic Auto Repair manual, the Stockel textbook Auto Service and Repair, and a Mopar Factory Service Manual for your specific vehicle. While Youtube is great for modern cars, there isn't a lot out there for what you will be dealing with, and a picture can be worth a thousand words! trust me on this.