5.3 or 6.0 engine

The 350 in my 68 is having some issues. I would like to replace it with an LSx engine. I'm going to try here first and see if anyone has a 5.3 or 6.0 engine for sale. I need it to be a complete, running engine. I need at least a long block, as I may put a carb on it for now, but if it includes anything else, that will be ok.

Also, I'm on a really tight budget, so the less expensive, the better.

if you end up needing any of the stock internals I have stock LQ9 pushrods, stock Balancer and random GM bolts for the LQ9