The post asking about American Racing Headers reminded me that they worked w/ BES in 2017 on a BBM Engine Masters entry. I don't recall seeing any article breaking down the details of the build, but did find BES has posted some pics and info about it with their advertisement about it being for sale.

https://www.facebook.com/besracing1...om-ross-pistons-10921-/1697210836969845/

I looked through the pics and noticed a number of "interesting" things about it. I'm curious if other people pick up on the same -- or possibly different -- things about how BES went about this. It was definitely not an off-the-shelf & bolt-together effort...
- looks like BES did their own CNC program on Trick Flow castings; different chamber design & different intake port location than standard 270; larger intake valve, copper valve seats
- cylinder heads offset (elongated bolt holes); cylinder head intake faces milled back; custom pistons to allow for moving valves away from cylinder walls
- RB intake on B engine; used both Trick Flow and Edelbrock Victor intakes
- intake ports appear to be MW size, but not using MW intakes; looks like intake manifold castings not raised at roof, but picked up additional port area by shifting manifold higher on face of heads
- windows cut out of block the same way Jesse Robinson did previously
- billet steel caps and bolt-on main cap girdle