the motor is far enough along and a question mark, i'd go ahead and do the ol' rattle bomb rebuild (gaskets/seals, chain, oil pump, freeze plugs) and you'll be able to inspect the bores, confirm the pistons, figure out what cam you've got and degree it.
the k is purely a judgement call. obviously it's much easier to do now rather than later but the question that you'd have to ask yourself is: will i get to it later?
personally, i much prefer the spool mounts. i'd do the t-bars regardless, the motor's out of it so it's a quick and easy one to knock out.
i guess it really comes down to budget and what is a priority.