Thank you for the quick responses. Grays came highly recommended already, though 12 hours away I'm sure it's worth it. I will reach out to these names on Monday and see what they can do for me.
I am not looking for a race engine. I am looking to add numbers to the 70 383-4 in my Polara convertible. I do not think I am unreasonable to expect to add 100 horse and 100 ft pds of Tq to this engine in a full rebuild while keeping it stock appearing.
Reliability and longevity Trumps everything else.
I likely should have asked for a transmission guy as well. I'm expecting to add a gear vendors unit since these Idaho roads are endless .