Any Old School Machinists Here?

Have a big block 440 looking to get built but I am installing after market main caps, main cap studs and girdle. I need an align bore and hone done. Local machine shop said they r 8 months behind. Friend with a boring bar that has bored cylinder walls for me in the past said he could do it with a boring bar.

I've never heard of using a boring bar for main caps? If this can be done would the mains need honed after bored? Is there any advantage to wait and have it done by a professional machine? Didn't want to wait 8 months but maybe boring bar for main caps is something that has been done for years and I'm just not aware of it
Nick at Nick's Garage had a 383 come into his shop because of a rear seal leak that seemed to never go away. Found out the customer had the block line bored. Doing that changed how much pressure was being put on the rear main seal. Nick fixed it by using an old style rope seal. He did say that it is rare to need to line bore a big block Mopar.