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1963B T6 Base car. I am changing tires due to age of the old tires. I have used 75 ft.lbs. torque for the past years. Is this correct?

I think B/C workshop manual says 94 but opinions vary. Al Zim says 70 I think. At the track tech always torqued them to 90. You should be fine at 75. See Al Zims answer here: viewtopic.php?t=12915 where he checked and found 35-40!!

Correct torque according to the factory manual is 13 m/kg which is 94 ft/lb.

Personally I don't need to change a flat very often anymore but when younger in the 60s it was quite common on the side of the road. Never torqued a lug nut. Never had one come loose. Tempted to tighten like the old days and then check with torque wrench. Bet I am nowhere near 94 ft/lb Now if you are using other than stock rims recommendation may be different. If using Fuchs 80-90

From the 1954 Workshop Manual:
We use 95 ft. lbs. when we tech cars for autocross.

Of course you realize that these torque numbers are meaningless unless the lubrication is also specified. For what it's worth, I have always used Permetex Anti Seize or moly grease on the wheels, moly grease on the threads, and snug them up by feel to about 70 lb.-ft.