Update: It just keeps getting better
It's been almost a year and over 20K miles since the engine swap was completed, and it's running great. I drove to the Appalachian Auto Works GTG in NC last weekend, about a 2,000 mile round trip. The car ran perfectly, and was as happy as ever to run at 80+ MPH on the freeway.
The big surprise was the fuel economy. I left the house with a full tank, filled in VA on my way down, and again yesterday in Harrisburg on the way back. One tank was 51 MPG, the other was 52. I hit 800 miles on the first tank just as the low fuel light came on. Lots of traffic, rain, and wind on this trip, and I was trying to drive as fast as traffic would allow in the way home since I did it in one shot.
IBW has received new control arms, rear axle bushings, Koni Reds, brakes, a wheel bearing, A/C recharge, front seat swap, and new Michelin Primacy tires since last year. The tires are probably helping FE. The other stuff just makes it fun to drive.
I just crossed 100K miles tracking FE for the car on Fuelly. Used to see a lot of low to mid-40s in daily driving, with high 40s on trips. I'm now up 5 MPG from when I started, give or take. Nice.