Please forgive my worrisome nature, but a half-inch sounds like an awful lot to take off to true up a head.
.005 is a shave, .050 is a haircut, .50 is pretty close to a beheading. Did they mill the top of the crankcase, too? If so you need to add the two numbers together to figure how much clearance you've lost between the tops of the pistons and the head and valves.
Double check your numbers with the shop.
.005 you needn't worry about the step heads .050 it couldn't hurt to check the fit cranking by hand as Hal suggested.
.50, you REALLY need to check. If the pistons you have in hand don't clear, a Fire Crater (more of a high spot or bump on one side than a step) or just a flat-top piston will probably do the trick. If that's the route you wind up having to take, you'll still get a decent step up in compression, just by having so much volume taken off the head.
I remember seeing threads in the past about a way to check that clearance using a dry fit with someting soft on the top of the piston. I'll give a look in the archives and see if I can find it -- if so I'll post back with a link to it.
You can also do some hand measuring in advance. The accuracy of your results will vary according to what you have for tools to measure with. You can measure the height that the step rises above the edge of the piston, and reduce that by 2/3 of the depth of your new head gasket (to allow for the gasket being crushed down by a generous 1/3 from its original thickness). That's how far your piston will protrude into the cavity in the head. Compare that result with the depth from the underside of the head to the surface of the valves. Maybe someone can chime in with what the minimum clearance there should be, to give you an idea of whether to go ahead and try to use the pistons you have, or to return them for something not as tall.
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