I imported my 77 in 04 from Africa and had no problems with it. Due to the age of your Land Rover it is exempt from FEDERAL EPA and NHTSA safety regs and shouldnt be a problem unless the state regs are more stringent. I was lucky enough to have the government move it for me so i didnt have to worry about much, but you need to do some research. Check with shipping companies that the US Embassy there uses as they should have experience with this kind of thing.
LHD or RHD doesnt matter, mine is RHD.
Be carefull and watch for scams too. Make sure everything is legit and all the documents for customs are properly and truthfully filled out. Make sure you keep copies of EVERYTHING. I have every bit of paperwork i could get on my truck that i could get my hands on, from when it was imported from the UK to Uganda to when i had it registered in Zimbabwe. There may be no VIN as the US is accustomed to, mine had a chassis and engine number as the only ID for it. This may cause a bit of a headache when getting it registered, but here in North Carolina i got it done by haveing a State Trooper verify the numbers.
Make sure you lube every working part very well and your tires dont leak. expect a dead battery and flat tires when you get it out of the shipping container, i am speaking from experience. It may be in a box for up to 6 months. Dont have anything in it or attached to it that can be eaisly removed, because the likely hood of someone else doing it for you is pretty high.
Hope it helps and good luck!
First but gone: 91 3 door Disco "White Rhino"
77 Series III 88 ex MoD "Shongololo"
Gone and I miss her: 97 D1 5 speed
04 DII
08 D3 (LR3)