Ferrea 5000 series valves are plenty good enough for the build you describe and much better than the factory OE valves. If you had a valve related failure, replace all the keepers with good quality hardened and machined keepers. Ferrea has those. If in fact the valve guides are knurled directly into the OE iron guides, I would replace the guides as mentioned with bronze liners and have them honed to fit. If your machine shop is a Chevy shop, it will take the same liners as a SBC. If they are going to cut the valve seats, make absolutely sure they know the intake seats are 30 degree. DO NOT let them talk them into changing the angle to 45 and ordering different valves. That would be bad advice.
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