Well, mine has springs of unknown heritage.
The wire diameter is about .49, a free length of 10", and about 6 active coils.
Running 205-50 x 15 all around.
It drags pretty easily going into parking lots if there's much of a dip leading in.
It clears most of the slowdown bumps on the street and in parking lots, though.
I figure the springs, aside from losing strength due to serious surface rust, probably sagged a bit when it had its 327.
I have the battery in the nose and a heavy brass radiator, with an unladen weight on the front of about 1000 lbs.
I intend to secure some plastic rub bars to the underside, so it will slide over obstructions instead of grinding.
Jay, and his mutant Corvair.
'61 2dr, custom fiberglass skin, transverse mid-engine - Buick 3800 supercharged V6 - hauls!
4-speed, auto trans