Need a little info.

I am having a lame time trying top find a `85-`87 Corolla or `89-`91 CRX here in Alabama, but that's not the point of discussion. I need to know all engines that will fit in the Corolla cause I am tryig to make a folder full of what I need to know and get. I have no idea what you guys are talking about when yall say black top, blue top, red top, silver top. Can yall point me in the direction of the best engine out there for this gem of a ride.

I know where I can get a 4AGZE with supercharger for $995 USD and a supposed 20V 4AG for $1095. Just need to know what I am really looking for.

I was just on another forum at club4ag.com and some guys weresaying that ya could slam a RB26DETT Skyline engine in the 86 or a 2J2GTTE Supra engine.