I found some where a chart showing the different length shafts needed between 7.25- 8.25-8.75 rears. I can't relocate it now. Where is this cart or what must be subtracted from the shaft to move from a 7.25 rear to 8.25?

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir

Do you have the rears? Just measure from the centerline of the axle to the center of the U-joint pocket in the yoke on both rears, there is your difference. I myself would prefer to measure for the drive shaft length while the rear is in the car, just to idiotproof things.

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Excuse me, does this smell like chloroform to you?

For the record
diff measurments
7 1/4 = 10 1/2"
8 1/4 = 11 3/8"
difference 7/8" longer. driveshaft to be shortend 7/8"
Measurement from 8 1/4 pinnon to trans tail including rubber dust boot is 53 1/8" this is with weight on the rear. Without weight on the rear its 52 1/2. So you can see that the driveshaft moves forward 5/8" when the car is raised.

Driveline place says its 1" difference according to the measurement from trans to pinnon that I provided. I can live with that.

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67Cuda,FAST EZEFI,340cu,CR=10.25,RollerCam&Rocker (XR268HR,#20-810-9)(#1622-16)(EddyRPM#60779,#7576), (MSD6AL,#6425) A904, GearVendorsOD, 8 1/4,3.55:1, ClassicAir