If the head could be milled that much.... IDK myself.
While the shape is good, actual amount of swirl is another story. Getting swir from the air and fuel is more than chamber shape.
I think you refur to this.
Also, the smalle cc amount to raise the comprsion is good, theres also no quench taking place. The smaller head cc amount (The heart shape now present) would be preety good (Or should be) with a zero deck piston or a domed one fitted to the cylinder heads chamber.
Oh course, this could put pump gas out of the equation. E-85? IDK, actual ratio would be of concern.