"Hemi" style rods for small block?

The weights on the boxes are a little on the higher end of "advertised" numbers shown for Scat I-beam and Eagle SIR rods. Summit shows Eagle H-beam rods at around 695 grams. OEM rods are heavier and it wouldn't surprise me if the rods you're showing are actually around 2 lbs. I had a set many years ago, They are "bulky" and have heard the term "Hemi-footprint" associated with them.

I'm sure they are stronger than Scat or Eagle I-beams. But they are very likely for sale because they simply weigh too much to be practical for 99% of applications. As mentioned, Mallory metal and possibly 340/360 cast crank balancer/flexplate will be needed with them. That may negate the cost difference between those rods and an aftermarket alternative. (It's cheaper to take weight out of a crank using lighter rods.)

Just my opinion, but with OEM pistons, OEM rods or H-beams would be plenty. Scat I-beams would also work for milder applications. It's just that the crank counterweights would require a good bit of lightening and the OEM pistons are on the heavy side.

What the application for this engine? Street, street/strip, race?