Total WAG with regards to the pic....... but.......
Since the 270 has raised port and the 240 doesn’t....... doing nothing but opening the 240 to MW size “shouldn’t” end up being better than the 270........ unless perhaps you do some other things in the valve job and bowl that prove beneficial.
Working just the opening, and bringing that work into the port about 1/2-2/3 of the way in...... I’d guess it would get you about 1/2 way from the 240 to the 270.
On the std port Victor and Indy SR, changing only the port opening from std size to MW size is hardly worth anything on an otherwise untouched port.
Because of how the transition at the roof is done, and the sizing of the port downstream of the intake mounting surface, a std port Indy EZ will pick up 20-25cfm going from the std opening to MW size.
On a bowl blended Stealth, it’s about 10cfm better at MW size.
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