I actually like the JBX, other possibles could be FEX or FE-XE or JB-XE as the "cool" parts from back in the day had XE on them before they had an actual part number, usually associated with experimental race parts from FORD before production runs. Also you see a lot of ROX and LSX ect. not that I give two shits about those heads. Howeever, they do have some badd boys in that line that put anything we currently have available, sad but true.
A few others could be FE-R for (race..ha ha, or R code) or JB-R. Keep them coming, something may catch Jay's eye.
Someone mentioned the expense on having to buy specific rockers and intakes to go with these heads. No big deal as that is how it always is. like if you had a normal 460, versus "A" heads, and "C" heads, all three take specific rockers and intakes to match up with the heads. Look at all the different Chevy head variants, lots of different specific combos, although some series can use the same manifold etc.