268 cam is decent and will make good power. I would have run the smallest thumpr cam and advanced it 5° or as much as the piston would allow.
They only need about 105lbs. of spring on seat and 270 open to work well.
A good converter will make ALL the difference in the world. Most likely a good 5000stall will work well in a stroker down the road because it'll stall more at that point.
Let us know how the 268 cam works!
Brian