26k stock 440 tolerate this cam?

Stock replacement seals will be fine with a single spring. As far as the retainers, they can look a little small, diameter wise, with some aftermarket springs, although they will work. Comp does offer some replacements that are a hair larger and also use the 10* vs a 7* lock angle. Pretty reasonably priced too if I recall. Just something to check out if you decide to move up with them.