Alignment specs for radials on my older car

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I'm trying to get some feedback from other members who use modern radial tires on their cars that were designed and came equipped with bias ply tires from the factory.

The car in question is my '69 Electra,I will be installing a set of BFG's TA's(235 70 15's) all the way around on 15x7 wheels up front and 15x8 on the back.The question is,should I stick with the stock specs for the front end alignment from the chassis manual or should I deviate from it and use some different specs.Also,what are you guys/gals out there using for specs on your own cars facing a similar situation.

I've posted this question on V8Buick also but I wonder what some of you who gather here have to say.Thanks.