The factory lower arms are a U channel (there was a sway bar between them as well) boxing the lowers has been done since new basically though and I did as well. (I went to an adjustable differently mounted sway bar on mine, similar to what the race cars ran in the mid to late 70's, same for an adjustable front bar as well)

These cars were road racing cars from the onset basically, so plenty of time to work out how to do things and lots to read up on with them luckily at least as well.

They are somewhat short as well..with a 101" wheelbase. (and around 2500 - 2600 pound curb weight originally)