Ram will not negate the benefits of the rocket valve. So yes, the valve is a great idea with any ram you have. You mention ram, so I assume you are talking about a T1.
I had to email maddman to get the T1 rocket valve. From their website, they said that they were going totally wholesale. I am not even sure you can get the valve directly from them anymore.
Email this guy off ebay and see if you can get it from him:
Yes, the sypder rebuild kit will work.