AFR MOPAR 340 HEAD TEST!

Mopar rated the 340's at 275 hp and 340 ft.lbs.
They also spec'd them at 10.5:1 compression with 63 - 65 cc heads., but most stock 340's had 72 - 73 cc heads at about 9.5 : 1 compression from the factory, 535 and 585 cfm carbs and made about 275 HP.
You could blue print the engine, mill the heads to 63 cc's for 10.5:1 compression and still be NHRA legal as per factory specs. With the bigger '71 thermoquad these NHRA prepped 340's would certainly make over 300HP.
I have seen about 5 videos where stock 340's dynoed from 274 to 284 hp. Maybe there were some early stock ones that made 320HP?
Maybe Dulcich lower compression 340 with the comp XE 268, different intake and carb made 100 more hp than stock.