I am in the middle of doing this with a B23 i picked up and haven't decided if it's going into my 1970 145 or my 1991 240 (5).
Your injection should be LH2.4 so it can easily handle the extra displacement.
I am currently into machine work for about $375 (offset grind and Ion Nitride), $100 for the rods (stock Mitsu rods) and I'll be freshening the head but not modding too much more. Fingers crossed that a gasket kit and some exhaust studs get me on the road on the cheap.
I'll be trying a 16V head later but for now just the longer stroke and I'm hoping more low end oomph.
I have an M47 5speed car which isn't the best but, I think, much better than the Auto trans options from these years. Hell, convert that too if you're AT.
This is all assuming you want to pull the engine yourself and get dirty. Otherwise this is a lot of $$ in labor.
search b23 / b230 2.6 liter and you'l see many threads and how to forums.
PS, lighten that car some! do you have the 3rd row 'mother in law' seat? HEAVY. Do you ever use the back seat? Pull it and leave the floor flat. I use my wagon as a truck constantly and never have the back seat up.
Lighter seats? lighter everything. how do you use this car? Can you loose the spare and jack and stuff? AAA is cheap these days