What to do for nitrous

allright im kind of a noob to any slant 6 performance and i dont want to do a V8 swap because i like that my dart gets better mileage then my cad soooo. i want to run nitrous into my engine and i have been looking at the offenhauser 4bbl intake manifold and then get the spray plate that goes on the bottom.but first things first i want to get the 4bbl running on it. and i going to have to do anything to the engine to get it to run right with a small 4bbl. and then any advice for nitrous, jsut run it once blow it up then rebuild ? thanks for any advice/insight to this !