They do not look like they are the same as the headers I know will fit, so I would not waste the money. Hooker comps are a good header-but they do hang a little low.
when installing the driver side header, I remove the carb, put a lift plate on in it's place and lift the engine with my hoist set off to the passenger side of the car. I completely remove the driver side engine mount and unbolt the transmission mount as well. As mentioned, it helps to have the car as high off the ground as you can make work, but this makes using the engine hoist difficult. I just put the driver side up on jack stands and leave the passenger side on the ground. When you pull this way, you are pivoting the engine until it will contact the passenger side shock tower. Makes a lot of room to snake the header in. Manual transmissions will require removal of the clutch linkage z bar during installation.