1.25 or so HP/C.I. from a 390

Like any other stroker... sonic test the bores to make sure they are at least .150" thick on the major thrusts. Stud the mains. I would also look into a set of modified EQ 1.92 intake Magnums and port them because a 2.02 valve will have some shrouding issues. Or plan to notch the bore to reduce the shrouding.