Total timing?

[PKRWUD]

42 sounds a little high to me, but hell, there are dozens of factors that play into it. That is also the reason that you shouldn't set your timing to a specific setting based on something you read in a magazine, or online.

You are going to have to experiment. Buy a recurving kit for your distributor, change the weights, and try one think spring and one thin spring, and see how that feels. If it's better, try two thin springs, etc. The recurve kits usually come with 3 different sets of springs, and by mixing and matching them, you can alter your curve. Don't forget about vacuum advance, too. The factory units have differ in the amount of advance they permit. Some only allow 8 degrees, while others go as high as 16.

Experiment. That's the only way to find what will work best for your combination of parts and geographic limitations.

Take care,
~Chris