looking for correct off set and bolt pattern
15" wheel
I want to run atleast a 8 wide in the rear and poss 6 wide in the front

 

Weld Draglites normally come in a dual bolt pattern. They'll have a 5 on 4-1/2" for the Ford pattern and 5 on 4-3/4" for the Chev pattern on the same rim. One rim can be used on small Ford or Small Chev axles. Yours will be 5 on 4-3/4"

They also produce other bolt patterns such as 5 on 5" or a 4 bolt pattern but those are more specialty rims.

You don't use offset with Draglites, you use backspace. I can't offer suggestions for 4th gen backspacing.

 

On a third gen, the most you can tuck in the rear tires is with 5.5" of backspace. On an 8" rim there shouldn't be a problem but with a 10" rim, some inner fender modifications need to be done depending on how tall a tire you plan on using.

With an 8" rim, 4.5" of backspace is more common.
With a 10" rim, 5.5" of backspace is more common.

Stock front rims I believe are 7" and they have a 4.5" backspace. Going to a 6" wide front rim won't change where the backspace should be.

 

15 x 10, 5.5" backspace. Get an adjustable panhard rod to properly center the axle, as there is only about 3/8 inch of clearance on each side.



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