dougs or tti headers

Quick question if y'all don't mind?
Do these headers (tti/Dougs) fit so good, can they be installed with the headers on the engine when dropping in the engine/trans?
Thanks for the info on the headers!

That's not something you can do with long tube A-body headers, regardless of the manufacturer. Only way to install the engine with the headers attached is to install if from the bottom.