Head/Cam/Intake Questions 91 LO5

Hey folks, as stated I have a 91 caprice with an LO5. I was wondering about capatability with L31 Vortec heads, what kind of intake i'd need for that head swap, a nice cam swap, and if all of this is at all possible while retaining my TBI unit and not disturbing the ECM.

Thanks for the feedback,
Matt

Also, my engine has appox. 150k police miles on it, runs clean but is a little tired. Should I be concerned with the Bottom End at all?