It is possible to do an "Upgrade", or it used to be so. You could put an entire TBI system on an older engine, but any smog parts directly part of the TBI has to be there & functioning. Such an upgrade means that you have to put the entire system on, can't pick & choose features you want or don't want, even if the original engine didn't have whatever it is you want to delete.
And, that upgrade doesn't excuse the absence of original emissions parts that were not engine mounted unless there is a direct conflict.