I believe your request is too vague. A 10.99 engine is a lot different than a 10.00, and a 10.x once is different than easy 10.x
Also, how dressed does it need to be? balancer and flex plate, intake, throttle body, fuel rails, injectors, headers, etc.
new? used? etc.
daily driver or trailer queen?
does the seller get a stock engine back in trade, and if so, what condition?
when did you need this by?
Note: I have nothing to sell here, just trying to assist.
Bob