I believe the engine is about the same weight or less than the 2.5L.
I havent had mine to the track yet. But a Quad 4 in a front wheel drive (poor grip) Olds Calais does the 1/4 in 14.7 seconds. Which is the 190HP W41 model, but I think Grand Am's and other HO Quad cars were doing the 1/4 in high 14's, and low 15's, trapping at mid 90MPH speeds.
This is what my fairly stock 86 Base coupe weighs:
Front: 550KG (1212/5Lbs)
Rear: 760KG (1675.5Lbs)
Both: 1290KG (2843.9Lbs)
I had 2/3 of a tank of gas, 50 lbs of tools in the trunk, and another 20lbs of other stuff. All my spare and jack and stuff, me in the car (160 lbs), and the battery is in the stock location. Car has a Dodge Shadow spoiler, power trunk release, no power windows or mirrors or A/C, aftermarket power door locks (~2lbs), and a sunroof. Almost forgot, I have a 5-speed Getrac 282.
Hope that helped.
OH, here are some stock dyno graphs scanned from a flyer or something, click on the links at the bottom of the posts:
http://www.quad4forums.com/forums/showthread.php?t=5619
As for wheel horsepower in a Fiero, a guy on P.F.F. dyno'd his rebuilt HO in his indy, posted the dyno chart, and got 166WHP, with no A/C, and basically the exact same as me for the drivetrain.