I got an idea to get that 450 HP figure and be durable and cheap. build it with the parts you have. Then get a NO2 system with a 250 HP plate at a swap meet. Then you can have the 450 HP reliable and cheap. JUST NEVER USE THE NO2, EVER. :wink:
The crate engine idea is a good one, that will let you get assembly experience without the trouble of getting machine work checked and get a warranty. You can always add on later to the combination.
Bruce