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Have you got a table saw?
It would clog the blade to death, you'd need to run them over a planer/through a thicknesses to try and get the thickness right afterward...
If they are reclaimed they've already been sanded once to match the first uneven floor they were laid on so if you were running them over s table saw just to skim the bituman off chances are a load of them will be 5mm off already which if you were pushing them through a saw against a fence would do you over.
Ah man, it's so much work.
I think the table saw is winning this currently- unless anyone knows why that would not work?