engine swapping

I am aware that people always put different engines from completely different makes and models into something else. How do you determine if a specific engine will fit in your car? I'm sure you would have to have the same engine and transmission. Do you have to get new axles and power steering pump and other such things when you do this? I want to put the engine from a Toyota Levin (ae101) into my 91 corolla. I have wanted a 6 speed transmission and a Levin had one. There was also a 6 speed that went with the 4age's that was used in some mr2's but there was alot of extra work that is involved to get it to fit. I figured it would be easier to simply use a different engine and transmission if it would fit. And besides, it can't be any worse than the engine already in my corolla. I've changed engines, just never mixed and matched them. Its always been the same engine coming out and going in. Any tips?

Toyota never made a 6sp gearbox for the 4a or 4f, motors, so I don't where you get the idea there was one in the AE101, or MR2.

There were several versions of the Corolla fitted with different versions of the 4age, and depending on what version you have the swap maybe easy, or impossible. They were built in a variety of different countries as well, which adds to the complexity.
To make it even more complex the Levin, Trueno etc, are really just 2 door Corolla's and share many components.

Toyota never made a 6sp gearbox for the 4a or 4f, motors, so I don't where you get the idea there was one in the AE101, or MR2.

There were several versions of the Corolla fitted with different versions of the 4age, and depending on what version you have the swap maybe easy, or impossible. They were built in a variety of different countries as well, which adds to the complexity.
To make it even more complex the Levin, Trueno etc, are really just 2 door Corolla's and share many components.

http://www.marcmedina.com/6speed.html
http://www.youtube.com/watch?v=UScLMAwEGPQ
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=230361203399&ssPageName=ADME:X:RTQ:MOTORS:1123

the first link is the guy in the second link and how he did this. The c160 was a 6 speed. However there was alot of modifications to be made. The third link was the engine I was intrested in. The 6 speed the first link talks about was the one I was intrested in. Until I saw the third link cause I thought it easier to change the entire engine since you have to pull the engine out with the transmission anyways.

I did a little digging, and yes your right, a very limited number of Japanese Truenos were 6speed from about 1996 onwards.

Your link to the page about the MR2 conversion should you give some idea of what sort of work is involved.
The MK1 MR2 has a back end that is very similar to the front end of a Corrola from the same generation (like yours).

I did a little digging, and yes your right, a very limited number of Japanese Truenos were 6speed from about 1996 onwards.

Your link to the page about the MR2 conversion should you give some idea of what sort of work is involved.
The MK1 MR2 has a back end that is very similar to the front end of a Corrola from the same generation (like yours).

Is there any way to find out the specs on the engine like the one on that ebay page? Like to see how much of what I have would match it and see what would have to be changed and everything?