7AFE to 5SFE ?, Upgrade 25hp? Options

[bigblock261]

I have a '95 ST Liftback 5 speed (AT200) with a bad 7AFE. I kinda hate to replace it with another anemic 7AFE but I'm not up to the 3SGTE swap. I see no mention of a 7AFE to 5SFE swap on the boards except that it is not plug-and-play and it is as much trouble as a 4AGE 20V or a 3SGTE.
MY question: What is required to upgrade my AT200 from 7AFE to 5SFE, and what year or years ST204 GT should I select as a donor car?
I'm hoping to hear I'll need the ECU and engine wiring harness from the ST204 and that the engine will bolt up to my transaxle. If the swap requires harness splicing and pinout changes I'll probably just settle for 110 HP and stick with the 7AFE. Thanks for any info.

[BBoYRuGGeD]

just adding a suggestion but u can also do what frotou did to his hotness of a car and go 7A-GTE... or just do a rebuild and beef the engine up for a turbo

[bigblock261]

UPDATE: We purchased a '94 7AFE from a wrecking yard with 89K miles showing, freshened the timing belt, tensioner pulley, water pump, spark plugs, and clutch. Time was wasted trying to remove and replace only the engine. (It comes out relatively easy if the crankshaft pulley is removed). We were unable to stab the replacement engine back in, with the transaxle still in the car. At last we removed the transaxle, then handily put them together (after recentering the clutch disc, it had slipped off center, presumably during initial attempts, as we had tried depressing the clutch to coax it together. Didn't work. That pilotless input shaft was a headache).

One more day's work had everything back together and running great.

Tip: Don't EVEN try to take apart the exhaust pipe at the flange behind the rearmost motor support. It will be rusty and impossible to work with. We cut the pipe about six inches forward of the flange, in the straight section, using a exhaust pipe cutoff tool (looks like a pair of pliers with a cutter attached). Later, we used a temporary splice (We took the forward section of the exhaust pipe to the muffler shop, as an example. They made up a very short piece of tubing to join the pipe back together, held with 2 muffler clamps). Once finished, we drove to the muffler shop and had it welded back together for $10. The splice tube was discarded.

We missed being able to drive the Celica while it was out of service, especially when gas got to $3.49 after Hurricane Katrina. Had to break out the V8 pickup (gas hog).