I'd recommend taking it all apart. It is not too big a deal. I rebuilt my first engine in my front yard as a kid armed only with a chilton's manual. Many tools can be rented at a parts store.
Af far as stuff to replace, all consumable type things inc. bearings and rings. At a minimum when installing new rings check taper and ridge and run a glaze breaker (dingle balls) to allow proper seating of the rings, check bearing clearances with plastigauge.
Definately factor new cam lifters and a good double roller timing gear set. Besides the seals and such you are nearly there, might as well do it so you don't have to worry.
Do have the block and heads tanked and you scrub them well, have the machine shop "do" the heads.
Other things to check is the distributor (get a new or reman electronic), carb, and the oil pump you mentioned.