Crank Shops for Offset Crank Grinding?

I owned two Opels years ago. If I ran into another Manta, i’d Be really tempted to buy it. What are you putting this motor in?
It's going into a '75 model 1900 2 dr sedan. Same identical drivetrain and suspension and chassis as the Manta, just different sheet metal. I rallied both off and on for about 15 years. Moving closer to retirement so I am getting to play a bit more with cars now!