Yes, the 403 radiator will work if it's in good condition. Mine was shot so I got a DeWitts radiator for it. It's the same dimensions as a C3 Corvette big block radiator. You just have to ask them to put straight LS size ports plus the steam port on there. Basically, no big deal really.
Oh, my car came with the HD radiator. That was the same size as the BB vette radiator. I'm not sure on the dimensions for a standard 403 radiator. I'm sure the standard radiator will work though for your LS. Just look at the size of a 4th gen Fbody radiator.
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Trey
Current ride: 2001 BMW 540iT soon to be manual swapped.
Former rides: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims
00 BMW 540i/6: Suspension, wheels, and ACS bits.
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