There is a parts interchange book, I think Joe has a copy of it.
Hell, I got a copy of it. I'm not sure which computer it's on, though.
As far as the pair valve area, the valve covers are the same thru the years since my kits fit all years of blackbirds. I know that the heads are different, likely where the injectors reside, unless they reside in the intake manifold. I don't know, really, whether the valve cover has any other differences from carbureted to injected.
If need be, I'll attempt to find the parts interchange book. If someone has the interchange fische on PDF (that is the format I recall having) PM me with the server location and I will go to the effort to look it up.
But for now, I can only say that I'm sure this fits 97-98 'birds.