i have found a link that has been some what helpful
http://www.unstable-hybrids.com/FAQ_CA.htmhere are some examples
Q: Would the ca18det line up with the transmission for a KA24E, and if it does could I order the CA without the tranny for a cheaper price?
A: The trannies are the same, with the exception of the bellhousings, so you would need to buy parts to make it work anyway, not to mention tracking the correct parts down.
Q: If you had a CA and SR with nearly the same modifications which would be a more powerful and reliable engine?
A: The one's we have had were setup differently. Dollar for dollar, the SR will lead the power race, till you break it, then the CA takes over, since it doesn't break at the same level as the SR.
Q: Are the SR and CA trannys interchangeable?
A: Sort of. The KA, SR, CA, RB20 and NA VG from a Z31 all use the same tranny, with the exception of the front cover/bellhousing. You will need the bellhousing for whichever motor you choose, but if you shred the tranny, you can use the one from your KA, with a tiny bit of work.
what exactly would this mean? please say it means i dont have to change my drive shafts