in 1970 the hp rating used was gross hp so 350 hp is what the T code was rated at then.
the 212 & 225 you're using is the 1972 net hp #s.
in 71 they listed net & gross hp #s
for example, a 71 U code was rated at 370 gross & 305 net, and a 71 T code was 330 gross & 220 net.
72 they only used...