If your new motor comes with a Stealth Ram already on it, then you won't need your TPI. You'll need a handful of parts off of it, like maybe the TB; that's about it.
You'll need new injectors. The stock 305 injectors will barely feed a 205 HP 305. A 420 HP motor will need about twice as much fuel (since as we all know, power does come from fuel...)
Your stock ECM will work, but will CERTAINLY need some programming. Expect it to run like hammered dog plop with the stock 305 programming.... if it even "runs" at all.
You'll need a 350 knock sensor and maybe ESC module.
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Numquam ponenda est pluralitas sine necessitate.
— William of Ockham, from Quaestiones et decisiones in quattuor libros Sententiarum Petri Lombardi
Roughly paraphrased into modern English, and applied to figuring out what's wrong with your car:
The simplest explanation that fits all the facts is probably the right one. | 
