Header installation ??

I remember way back when I was putting a set of headers on a 73 340 duster (my first attempt at header installation). Had unbolted motor mounts and raised motor with jack under oil pan. Finally got header in and bolted to head. lowered jack and engine stayed up. By this time was sorta pissed and went and got something to drink. came back outside and engine had fallen back onto mount. I quickly put motormount bolt back in. The way things were going I didn't want the engine to jump back up! good luck.

don