Baltimore mack is the only place i would take it n md
OP not sure if your drag racing or pulling, but here is a 12v puller we built last year. Ford Cummins Twin Turbo Truck Pull 411 feet OSR Performance - YouTube
Tim Barber, TRE Diesel, in VA.
Have you ever built any other 12v puller engines wade?
Sent from my iPhone using Tapatalk - now Free
Baltimore mack has machined and assembled multiple high hp engines for members on this site. never heard of harshman, their website looks very professional. I have always used Dennys auto machine in Hagerstown for gas engines ( not sure if he deals in diesels, never really asked) , mainly because I was on a tight budget. Dennys has been around for a long time and they are easy to work with.
advice, talk to most of the places mentioned above and go from there.