340 plan is to get more streetable than the 340 X Block build.
I thought at 1st the head chamber pic above was my Comando heads. But was in fact the Eddie's for the 422ci
Here are the heads on my 318 X Block (340 race block) 4.040 bore stock steel crank, forged (heavy) pistons with to high a compression.
Stupidly built not streetable.
Thus the 422ci.
Only pics I have of the. Mopar Comando heads. They did not fair well with guys as cost was high. And performance was just OK.