I’m thinking along the same lines as DJ
An S13 with an SR can be pretty hard to sell right now. Even if you go through all the trouble and find it doesn’t drive the same you remember then you want to be able to at least sell it and get your money back.
The SR swap will be the biggest bulk of the cost and probably mean the most downtime. A frame pulling place will take a day. To put on and line up new panels another day. An SR swap might take a week if you are doing it yourself. Do you have anywhere indoor to do it? Car work in the middle of winter is not fun at all.
S13s are usually a little different. Most places take care in shipping over the S13 front end. It partially ads to the cost. Everyone wants to convert to the JSpec style front end.