10.5:1 CR built bottom end with good heads and MLS head gaskets. Good nitrous plate kit. You'll need all the accessories such as:
- bottle heater/nitrous pressure gauge
- window switch and WOT switch
- big bottle (you don't get many good hits off of a 10 lb bottle with a 250 shot)
- effective fuel delivery to supply all the extra fuel
etc. etc.
It's also good to have several different bottles because you'll be filling them constantly.
Honestly, after all the cost and effort of putting together a nice kit like that, you can just put a blower on and not have to worry about filling bottles or stuck solenoids.
Paul.