It's kind of interesting (to me) to compare the rated rpm's for these motors.
__________HP________TQ
'71 340 - 235@5000 - 310@3200
'73 340 - 240@4800 - 295@3600
'74 260 - 245@4800 - 320@3600
Doesn't make sense to me why the '73 340 with lower compression and a log manifold on the right was rated 5 hp higher than the '71 340. But the rated RPM is different, too. Maybe the first generation TQ hurt the hp on the '71? I mean, all three have the same cam so it would seem like peaks would be pretty close, right?