Help with a engine

[cocbrazil]

Hi Friends,
I'm building a Cobra Car Replica And I'm very interested in buy the engine below. First because the price of this turnkey engine and second because have a good horsepower.

Shelby Aurora V8 DOHC 4.0 Engine
You are bidding on a Shelby Performance Modified 4.0L LS47 Aurora V8 Engine 320 HP with flywheel and starter brand new in factory crate motor with ECM, Engine Harness and Electrical Wiring Harness AND Cat Black Headers. This motor was used in the Shelby Series 1. The series 2 factory closed down and these performance engines were sold. 4.0 liter DOHC, 24 valve, 320.0 bhp @ 6500 rpm, 290.0 ft lbs torque @5000 rpm. 87.0mm X 84.0mm bore X stroke. 10.3:1 compression ratio, 80bhp liter Weight: 573 lbs.

US$ 2500

I have a doubt because I don't know if there is parts to buy in the market if I have problems with this engine in the future.

Do you know if is a good idea buy this engine?
And what is the transmission that I could use for it?

Thanks for your help.
Regards,
Cristiano.