Here are a couple of pictures of my engine. I know some mention that you don't have room to change the plugs, but as you can see here, the lower mounting of the engine gives much more room between the cover and the body. Overall, the engine fits in the bay just nicely.

This is an interesting point. I have driven all 3 of these swaps in a Fiero you listed above now. I think any swap is a personal choice of course and should go along with what the individual wants but if you'd like to hear my impressions of these three choices i'll give a breif commentary on them (i'd be happy to go into more detail with anyone who feels like discussing them though) i liked all three of these engines in the Fiero. The 3800 SC was all about brute force. The only way to describe a 3400 for me is to say that it's like a very quick more torquey 2.8 that also manages to be much smoother. I almost bought a 3400 powered Fiero in fact. The person who bought it bought it on the day i called the previous owner to tell him that i wanted to come pick it up. I have driven a built up 3.4 Camaro engine in a Fiero and the 3400 was much nicer in my opinion. The 3.4 DOHC engine, again in my opinion, had elements of both the 3800 and the 3400 and i'll explain why; while it did not have quite as much raw power as the 3800 sc it had quite a bit and it was certainly more then the 3400. The 3.4 DOHC engine, like the 3400, was far smoother then the 3800 sc and even smoother then the 3400. This comes to why i am liking this engine so much. It is pleasing to me and fits what i think of when i think of a spaortscar. It revs but has torque at the same time. It's smooth on the highway and yet will push you back in the seat. The gas mileage seemed superior to the others as well. I think we only used a 1/4 tank getting from Iowa to here. I don't normally pay attention to mileage so hopfully either Jeff or one of the other DOHC guys will come in and make a comment about this. Again i must also say that this engine seemed suited to the Getrag quite well too. This is an element the other 2 engines, in my opinion, don't have. It was very easy to get the DOHC in it's band with the Getrag. The other engines, in my impression, were more picky about what gear you're in. This DOHC engine also makes that ultra low first gear actually usable for more then just a second. As i'm pulling out of places where i would have to stop soon afterwards i could actually leave the trans in first where normally i would have to shift to second. That's not a huge deal to most but it added to my opinion on the overall goodness of this engine in the Fiero as it was so versatile.
You may have noticed that i stated 'in my opinion' or ' my impression' an annoyingly ammount of times in my post here but i did this for a reason. I enjoyed all 3 of these engines and would be proud to have one of these in my own car so i wanted to make sure everyone knew i was not cutting down any of these other choices. This is merely my own opinion when comparing them all and, like i said before, a swap is or should be what that particular individual wants or likes. What i like is not necassarily what another person would like or want in their car.

First I don't think Chris is anywhere near 15psi, I think it's under 10psi, call him he'll tell ya what it is.