This group had a terrific thread a while back on comparing Packard 12s and Pierce-Arrow 12s, and I was hoping to get the wisdom of the group on another comparison: 1931 Cadillac 355a (the V8) versus 370a (V12).   In particular, I'm interested in knowing how the ownership experience of the two cars differs in terms of drivability, reliability, cost of repairs, and the like. I have heard second-hand that the V12s are harder to keep on the road because of the dual carburetors, and that the added we