Seems extremely high, but I haven't ever paid for install or build labor so I can't say for sure. I bought a Ford 302 long block last year for a '40 I built- it actually came with everything but the accessories and carb- $1,700. It even came with a 12 month warranty. I'd think a guy could have that bought, installed, and running for less than $5,000 easily- especially since you have everything there to swap out already. I'd recommend shopping around, or maybe even get a quote for them to install an engine if you purchase and provide it..
Buckle up- I wanna try something!!