Well, the 2.0 litre cars had all of 95hp, the others, less. You're looking at a 0-60 time in the 9-10 second range for a 2.0 without CA smog equipment. The 1.7's were very slightly slower, the smogged 2.0 engines slower still, with the 1.8 litre cars bringing up the rear in the 12-13 second range Not fast by any stretch of the imagination. To be fair, even the 911's of the time were running only 7.5-8.5 second 0-60 times, and once up to speed a 914 almost never needs to slow down, you just drive right through a corner and the car's so light and well-behaved that it sticks and goes.
Overall, in the straight line, the 914 is only a tiny bit faster than a 356. It's the corners where the 914 really comes into its own. That, and the fact that you can shove a flat six from a 911 into the 'teener's engine bay and not upset the handling at all. 😉 I haven't gone that route, but it's always fun to think that I could.
ZV