[AlBondigas]

My memory = completely opposite from yours, i.e.
Z went from 2.4L to 2.6L in'74? to compensate for emissions hdwre.
('74 also was 1st usage of cats by most of the imports)

You might be citing mag reviews of (Fed) cars, but the '74 260 (cal) was a total stone
The hot setup was to get a 2.0L (Jpn) I-6 from K Watanabe

[freebilly]

Hmmm...., just read two different reviews of the 260z. 1 had it 0-60 in 8.8sec. The other had it 0-60 in 9.9sec. Big discrepancy....