340 Help. Am I looking in the right spot to fix the issue

Unfortunate as that is, it saves time, money and aggravation even if you have to travel to find one. Lucky for me, my local builder does it all. 1929 Cord, 302 GMC all the way to race engines for local short track and drag racers.
That is a GM motor yes my one shop does those, Mopar not so much.