70" 340 vs 72" 340 specs please

hi the 72 340 is 8.5 cr, versus 10.5 for 70/71 the cams are the same period!!!
net hp was measured with accesories attached. gross hp was with none. as far as power, the 72 340 is as good as the earlier 340's. 240 hp is way underrated. the 72 used 1.88 valves, 70/71 had 2.02 valves.the 1.88 valve head does flow very well, has higher port velocity. in stock eliminator the 72 is as fast as a 70 340. just food for thought.