Yes, my engines are turn-key. But even if they weren't, I wouldn't sell one without a harmonc balancer....
Here's a list of what you get with one of my engines for around that price....down to the starter, braided fuel line, etc.
B2 Motorsports LLC
Flygirl...
Give me a call if you want to see what your options are in regards to engines. If you go through ERA, they will probably source your engine through Danbury Engines. I've heard good things about them, but if you wanted to price shop, any of the builders (including myself) that advertise here on Club Cobra would be happy to give you a quote. We all work with the different Cobra manufacturers and ship engines to them on a regular basis.
Even if you go through another builder, feel free to call me and pick my brain about your engine choices. I wouldn't discount the 390FE route. With the stroker kit, you can have more streetable horsepower/torque than a comparatively built 427 S/O or C/O.....for a lot less money.