Need information about center sections

Hi everyone,again i need your help, this time its about centre sections. In my 74 dart sport iam running the 7 and a quarter rearend with 276 gears. the plan is it move up a 489 8.75 sure grip rear end with 410 gears. My question is this, does all mopar 8.75 center sections come with a 30 spline? Did any come with a 29 spline? or was that on the 8.25. I Also was wondering if i can use my axles with the 8.75 center section. Will there be any other changes like the yoke or u joints that i will need to change also. Any help and information is grateful. thanks .Newatthis
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