6=8 and bore over?

My limitations are max 6k$.
IF you can do your own work, you could perform a VERY nice V8 swap (Mopar 360 or 318) with that budget. If you want to fix the six (hey, I'm a poet), that would be up to you. I'd do some serious soul searching first. If deep down inside you want a V8, then fixing the six will never satisfy you. Be sure before you proceed.