Short of sending an existing cam core from you,no as far as I know.Not much call for 86 to 91 rollers on a budget.When I called Crower for my Maggie roller,new core.And the casting nos matched a Comp hyd flat tappet from 86 I picked up cheap.
This may sound elementary, but how can regrinding a existing cam result in a new profile that has more lift or longer duration? This seems physically impossible, without adding new metal to the lobes.