You can run .061" jets with no problem if you're using ethanol-free fuel. We run .061" jets in our 434's with the same center carb. I began with .063" jets, but tried the /061" with no downside.
With E10, I don't know what would be best, but I suspect /061" would be OK. Some recommend one jet size larger for E10 than pure gasoline. I know of no basis for that, but several car friends say that.
In any case, use .070" jets in the end carbs. For the restorations I do with lumpy cams, more cubic inches, I use .073" end carb jets.
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BONESTOCK GOATS
'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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