Sorry, I forgot to mention I didn't get a chance to mess with the new timing light yet.
I think I set it to 600-650 in gear. I'll re test it as soon as I can with the RPMs noted.
Leave it to me to mess with a good thing. This car had a great running 305 with 250000k on it. What a headache this new engine is turning out to be! Once I've got it tuned, there's still the matter of a heavily leaking rear seal to contend with!
I really appreciate the help so far!