They're okay. Its someone else's design (obviously) and its probably a 20yr old design (or more) and its probably pretty close to spec. If the only thing you're ordering is a cam and lifters, if its for anything more than a street car, I'd contact Mike Jones @ Jones Cams in Denver, North Carolina. They do custom cams, turn around is 1-2 weeks and he has no problem shipping to you. Price is about twice as much for the cam, but the lifters he quoted me were cheaper than the expensive ones you asked about.
Now, I don't know if he has different prices for basic hydraulic cams or not; this was for a basic motor (307 SB Chevy). But he'll give you exactly what you need