The AIR injection is just a gimmick anyways. It basically pollutes the exhaust gases with fresh air making the exhaust more cleaner. But in reality it's putting out the same emissions, just appears that its not. I bought a set of Edelbrock headers for my truck and it has AIR provisions, I think that's odd. I'd rather not have AIR and my truck never had it.
If this thread is talking about your '88, then EGR shouldn't affect anything dealing with your exhaust manifolds.
Oh, and headers usually require the use of 90 degree spark plug wires for all plug wires. My Edelbrock kit came with 2 boots and 2 terminals.