My son is building a 1973 Chevy truck original can color was silver. With a little research (glove box was gone so no paint code) turns out it is GM paint code 63. My Barracuda is A4 silver
We went to paint shop last Friday to get color paint for both, he is doing the inside/dash frame/firewall. I was redoing the engine compartment on the B'cuda since the roll cage bars basically trashed the old paint job.
As the guy is mixing both he says they are identical formula except the A 4 has 1.3 grams of green in it for a quart.
A4 is a great color!