Your looking at 32-3500$ for a decent stroker rotating assy. Plus machine work, and the misc stuff to put it together.
You MAY be better off buying the engine, and selling the parts on ebay. I parted out my 94's old engine a while back and got 270 for the block, and another 250 for the heads. Cam covers sold for over a hundred, and oil pan/timing cover went for another 100.
I've still got the crank, and the pistons, but will prolly go to the scrap yard, as I don't have a use for them any longer.
The decision is up to you, but you need to know that the Modular engine family is EXPENSIVE to mod/work on compared to older ford/chevy stuff. Maybe one of these days, people will get thier heads out of thier ass, and get on the modular program.