Yes, not as trivial, but still is possible to try.
I have test implementation in Vivado, 2 cores * 350 MH/s = 700 MH/s in K7 325t.
Is it a good hashrate?
Yes, but not for a $1K board, GTX 1060 has a similar hash rate.
Did you get your design to PAR without errors? If so, how long did it take?
You can buy many 325t for 1k USD.
My design is built without PAR errors. It is counterproductive to have timing errors, since good shares an blocks could be lost.