Easy way to tell...351W will have distributor in front of engine by belts and 454 will have distributor at rear of motor towards the tranny. Not everyone on here is a mechanic so don't worry about the questions, a lot of good guys here that can help you out.
I had the neutral safety switch issue on my Rider and it would not give any indication at all. Complete silence. Click, click, click sounds more like starter to me.