I'm going for a budget build on my 91' 4.3l v6 non vortec, I found some nice headers on Ebay but it says they're for 95' and up, will they fit my older model 4.3? Thank you to any help

So I bought my 99 Jimmy and the previous owner swapped the engine for an 04 I believe he said but my issue lies in the fact that every picture I can find shows an EGR part stuck right up front. Mine had the part hanging off to the side unattached to anything but the wires over by the CPU and...