wew

I have searched and I have found answers, but I am mainly doing this to make sure I don't screw anything up or forget about anything. I'm also no sure if this is the correct place to post this.

The car is a 1990 240 w/ ka24de. Car is pretty much bone stock w/ exception to cosmetic things. I plan on dropping an sr20det into it, and I've found a motor from jdmtigerjapanese.com (any reviews on site?) with just motor or motor+trans. I've seen people saying the sr can use the stock ka trans with an sr bellhousing, is this true? From what I've seen the stock wiring harness can be used with some work on it, but am I able to use the ka ecu? (From what I've seen I don't think so but just checking.) If I need an sr ecu where the best place to one, ebay most likely?

I will be performing this swap with my father who has worked on many older cars so he knows technical things, but when it comes to computers and turbos count him out. This is my first turbo car and it isn't a purpose build. Just trying to build a 300-325 hp car that I can street. I have loads of other questions but I just want to get the basic swap down first. I know all of these questions have been answered but some links don't work anymore and I'm just trying to plan ahead. I don't aim to piss anyone off. Any recommendations for the swap or things to buy are greatly appreciated.