ZEX kit on a stock motor ?

So i'm thinking about getting a ZEX kit for my 98 Civic DX. I've got i/h/e/ and a nifty little test pipe (not that it does anything just wanted to share) and the high volume AEM fuel rail along with a cam gear I haven't istalled yet. I'd like to get a 60-75 shot of ZEX and run it stock ? Is thiis safe or do i need to get new rods and pistons. Also, what would i run with a 75 shot ? Right now with i/h/e i run a 16.2. Stock I ran a 17.4 so......