408 Stroker

I think i found the one problem they went with the wrong cam.
I said match the specs to the Big mutha thumper witch are:

Lift @ .50 INT 243 EXH 257 Valve lift INT 533 EXH 519

I got the mutha thump Lift @.50 INT 235 EXH 249 Valve lift INT 522 EXH 509

Would that make that big of a difference.