I have just looking around for other suggestions.Learn to read. These forums are a goldmine of info. Lots and lots of 400hp recipes. I'd suggest starting small and learning what your doing first. Learn to make 250hp, then 300hp and up.
How do I know if it’s a eprom ?Big 16g won't get you to 400. But it will make one hell of a fun street car. You still need an adjustable fpr and a way to tune it. You might get lucky and already have an eprom ecu. If not, start hunting for one. I bought a 2g eprom for $100 a couple months ago on ebay, deals are still out there.