The 8.1L is a tall deck so a little heavier than a standard deck BBC. I think the mounts are GTG since the 8.1L has so many lightweight parts.
'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.