Scott, My 3.4 came from Grooms.
Just a tip... If you buy it through Ed Parks, he can modify it for you, for installation in the Fiero. (Involves drilling the starter holes and... not much else, in your case. )
The up side of that is that if there is a problem, Ed can do the warranty work for you.
What does that mean?
I bought my engine from Grooms, through Ed. He did all the block mods required to make it fit into an 88 Fiero with an automatic. (More stuff than you'll need.)
I went and picked it up and installed it myself.
During the break-in period, it blew a head gasket due to a broken head bolt.
I towed it back to Ed's.
They removed it, shipped it back to Grooms to be re-rebuilt, and reinstalled it in the car. Grooms paid Ed for the R&R, even though I did the initial install myself.
I've beat hell out of it for 15-20K, and even taken it back apart to install a big cam and ported heads, and have had no more trouble out of it.
I certainly can't complain.