Doable. . yes.
Easy or cheap. . .nope.
Here's some light reading on an ongoing project from TC doing this into a '70 Chevelle.
'67 Hell Camino-BB 427/TH400/4.10 His
'67 Biscayne-BB 427/TH400/??? Hers
'66 Chevelle 300 Deluxe- 230/PG
"Good people sleep peacefully in their beds at night only because rough men stand ready to do violence on their behalf."-Orsen Wells
Strong people are harder to kill than weak people. And they are more useful in general.