wheelman, they will work with your lt1, no problem. a good set of gaskets and you're good to go. i also highly recommend stage 8 locking header and collector bolts. is your setup jtr or hooker? the reason i ask is that depending on your car's ride height, they may be a little lower profile than you want them to be if you're using the jtr kit.
my friend has had his set of headers that were in the picture on about 4 different engines with great success at the drag strip (a best of 6.88 seconds in the 1/8th mile with a 400 sbc). now he's going for smaller 6's with those same headers. as far as clearance with the steering arm, his car is a '71 with the hooker/scarab kit, and they are about an 1/4" away from his steering arm. he does have a few marks on the headers from the steering arm touching during some of his high-torque moments. my friend and i both use high torque mini-startes and have had no issues with header clearance. for oil filters, we use the 1/2 quart k&n.
sorry the pics aren't so clear. the passenger side header does indeed hang a little more than an inch lower than the driver's side.
they aren't equal length primaries, but they are pretty close. for instance, on the driver's side, the 3rd and 5th cylinder primaries are basically the same length, but the 1st and 7th are a few inches longer. they are close enough for gov't. work and having fun, though 8)