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Re: 2.9 L 4 cyl in a Fiero?
The Chevrolet designed 151ci, 153ci & 181ci Mercruiser L4's were the inspiration for Pontiac's "Iron Duke" - the question was can it be put in a Fiero, and yes, it can. Since it shares the bell housing pattern with the small block v8, all that's need is a V8archie adapter. The motor mounts may be a little wonky but that's easily fixed with a little inspiration, an angle grinder, a handfull of steel plate and a welder.
Building up a 2.5L works, but it's BORING. Tossing in a mercruiser is the kind of stuff that makes the project unique and fun. GO FOR IT.
As far as the number of cylinders goes, it doesn't matter if you have 1 hp or 1000hp, the more cylinders the engine has the less strain there is on the individual components because the work is divided evenly between them. Four people can build a house, but if you have 8 people they'll be 50% less tired when they're done.
Besides, regardless of what engine it is, 1000 hp is only good for one thing, going straight forward really fast, usually on the 2 rear wheels. Wake me when it's over.
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Wanted to buy:
86-88 Fiero GT, 5 speed, fixer-upper. Blown motor, no motor? No problem! Rusty unibodies need not apply.
74-79 Ramcharger or 100, slant or no motor - not interested in v8 - Overdrive 4 is a big plus, NO hopeless rust buckets!!! 
3Rd gen F body floor pans/camaro door skin (L)
 Why is it I see so many "Proud to be an American" bumper stickers on the backs of cars made in Japan or Korea??????
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