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Lt1 headers don't fit vortec ports well and do not clear the early c4 steering shaft.
I had l98 headmans on my 86 with vortec heads and they fit fine. When I swapped the heads for GM fastburns which use lt1 exhaust ports and gaskets I had to do some welding and grinding to fit the ports. After I bought the lt1 OBX headers which fit the ports I had to change the steering intermediate shaft to the lt1 shaft to clear the headers.