nebulous

I am now leaning toward the LO5 to put in my 91 305 TPI TA. I have been scouring the message board trying to get the info before just asking the same old questions, so here goes... I will be putting the TPI intake on this engine. Is it true that the only changes I will need to make are injectors and knock sensor??? I understand I will need 22# injectors, the engine will be supercharged so should I go higher? It also seems I will need a new knock sensor, should I just get the one from the 92 Caprice? Are there any other modifications I will need to be aware of? Also, the eternally subjective, and most commonly asked question: [i]How much HP/TQ can I expect from this engine with the TPI intake(assuming no mods at all)????