2.0 vs 1.8, really now, is there a true difference? Options

[lostmybaby]

I posted on this board about 4 days ago after being saddend by the loss of my 1976 914. The car was crunched by an escort and considered a loss by the insurance company. My mechanic can not find anything wrong with the suspension, however the rear back wheel appears to be 'hyperextended' pushing out from the bottom away from the car.
Plus, some brake calipers need replacing, the clutch -after driving for a while- the clutch cable makes a grinding noise when you push on the pedal (may just be a bushing?). Well you add all of that to the ugly dent in the side and I've been shopping for another car.
HERE IS THE QUESTION: I HAD a 2.0 liter engine that was strong and way too reliable to be simply mechanical. The oil return tubes needed to be replaced as they leaked oil, but I actually liked knowing where I parked by my spot!!!
So, I'm looking at 1.8 liter cars and want to know, other than the numbers (1.8 -2.0) will I really notice a difference when driving. Is the 1.8 that much more sluggish??? etc.,
My options are to drop the 2.0 engine into the 914 I purchase and sell the 1.8L engine.
Now, I'm just casting this question to the lords of the 914 to determine which route 'they' would choose.

THANKS EVERYONE FOR HELPING ME DETERMINE THE PRICE OF MY CAR. IT REALLY HELPED ME DEAL WITH THE INSURANCE COMPANY!!!!
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