Is this safe to do?

Hello again I gotta 93 chevy caprice original engine 305tbi, now fitted with a 350tbi out of a 1 ton van, new knock sensor from a truck350, a ecs module but I don't know if it's a 350 or not what are the Part Numbers for that I got a bunch of them, and last a computer from 92 buick roadmaster with the 350 tbi engine. Is that a safe combo truck engine with a car computer am i gaining power or loosing power with this set-up also my friend has a hypertech chip that he wants to give me its from a 350tbi truck engine will that be compatible for my car computer and anyone install headers on this type of car I have a old set of longtube headmans from a 79g-body monte carlo. Last thing i want to upgrade the cam on this engine what the best availbe one to use without loosing my vacuum any information would help thanks!

Hellllooooo anyone...I can still use some help!