Originally it would be 7260 at both ends on an A body but if you need a 7290 it could be built that way... Personally when I need a driveshaft I try to find a C body shaft & have it cut down...
And yes the measurement should be center to center...
I'm going to cut down the A-body shaft if I can't find one done already. Long shot but you never know. When I put the power to the rear with the 440 I'll use my A-body BB drive shaft that came from a gentleman on here who ran the same combination before upgrading shafts.
