Is there any fitment problems with TTI- Big Block -A body

Shameless plug for installing the engine from underneath...if you have the correct tools.

Yes, you should have your alignment checked afterward
Yes, you need to reconnect steering shaft
Yes, you might need to do some other stuff

But:

It's how the factory installed it, you don't have to dork around with installing the headers over the fender and under the car scraping up your knuckles and the finish...you can install the engine almost completely assembled, it's a good excuse to clean up the undercarriage and replace bushings and such while you're in there.