I think the weights are the same as SBC, I have had both, just never had them side by side to compare or looked them up to see if there are any difference.

Yep two piece shafts.

Gears are different than a SBC, not interchangeable.

These are available. http://www.ebay.com/itm/171-RS09-DISTRIB...bcad7ec&vxp=mtr

These are cheap, but, can't comment if they are good or not, but it's new.

MBHD

12 port SDS EFI