Possible to put a 1991 318 fuel injection on my 1973 318?

drivability???

It makes less power than a carter AFB......
Gets worse economy than a Vac Sec Holley........
Isn't as reliable as a quadrajet......
And has a idle motor that thinks it knows more than you, when it doesn't.

The ONLY advantage of the TBI is you can turn the key and walk, sometimes, providing everything is working good, and, uhm, the cam is stock, and, you don't kill it when hot, or run it for 30 seconds, shut it off, and start it again when cold.....

Not understanding why, maybe you have your reasons.