The real deal LW parts were never common, even though sold over the counter, or so they told NHRA.

But, with some work and deep pockets, you could get pretty close. I think a few smalls like block off plates for the radio/heater have been reproduced or sourced. The fiberglass body parts would be the tough bit if you wanted genuine originals. I don't think those have been reproduced, save for the hoods.

It would be a lot of fun to have a full on HR 427 to play with, as long as you didn't need to turn or brake!