Turn Key Engines

[Moseley618]

Have you guys had any experience with Turn Key Engines. I can get a LS2 510 Horse with the correct serp system (AC,PS,WATER,ALT), Long tubes (coated), Fuel system minus the lines and tank, engine mounting brackets to mount to original sub-frame and wiring harness (5-wire hook-up) for $12,100 Also I can get a LS3 for $12,400 with the same stuff which one should I go with?

Thanks

Kevin