2 75 shots? Hmmm. I'm guessing you mean a 2 stage system? Anyhow.
Get a compression check. If all goes well you should be set.
75 shot is the max you'll want to spray on a stock engine. No, I/H/E don't allow you to spray more. They just help in producing the end product, power.
Here's the list of stuff I'd recommend for you (I really ought to add this to the FAQ since it gets asked ALOT).
1. ZEX Nitrous Kit
2. NGK V-Power copper plugs (depending on shot size 1 to 2 steps colder)
3. Nitrous Pressure gauge
4. Air/Fuel Ratio gauge
5. ZEX Purge Kit
Items 3-5 are optional but
HIGHLY recommended. The ZEX kit will be the easiest to install. I don't that some people think you should go witha more flexible kit. I would never recommend that to someone who has no experience with the gas. The ZEX kitt will give you 55, 65, and 75 shot sizes. More than enough to keep you amused for a while. Start with the 55 and work your way up.
The ZEX stuff can be bought from
www.evanshondaspecialist.com . Excellent customer service and the guys actually know what they are talking about. Something almost unheard of in most shops.