abs wont be a problem. the conversion has been covered many times. i was doing this on my project teg but in the end i ended up finding a DB2 (gsr) and got rid of the project. as long as you have a donor car your good to go. the only custom work is a 1 3/4" hole to drill and youll need a costom tranny mount. the mount is now made by innovative mounts. they are about 150. they might be cheaper now. also you'll have to drill 2 holes so that you can bolt the shifter in. when you remove the auto shifter which is a bitch there will be a oval hole you will need to patch. weld in some metal. also there are 2 hoses that run from the auto tranny to the radiator. i never got to this step but you should be able to just remove them from the radiator. here is a list of the parts you will need to retain from the donor car
tranny
clutch disk and pressure plate
flywheel
intake manifold
engine harness
ECU
shift linkage, shifter, shift boot
manual pedals
clutch cable
flywheel bolts
clutch bolts
new bearings.
clutch cover and bolts
manual gauges ( optional )
removing the auto pedals is also kind of a bitch. best to remove the dash. if you have someone that has done this before its no big deal. if not make sure you have at least 2 days to do it. or a week end like fri night - sun night. if you have never removed an engine or tranny before this is gonna take you a long ass time. but hey we all learn somehow
good luck. im here if you need more info