Replacement 68 340 four speed cams

Hello all, I only had three truly interested parties and unfortunately that's not enough to get this project started. I'd like to get it going but it's not worth while for Jim and I to be able to even achieve a break even point. Blank cam core costs have risen over the past year so that puts us even further into how many need to be interested. I'm sorry I can't be of more assistance.
What if I had a 78 LRE core with a bad lobe, could this be reground back to original?