Why oh why would you want blocks on a P?! I don't think much of the basses, especially when Nash are out there too, although the Tele/Les Paul Jr hybrid guitar they make has something about it, shame the pickup is mounted so close to the bridge.
This is a Gibson thread! Lol. The Jazz was a non export CIJ 66RI that has since been sold. It had a metal nut, Badass II and a pair of one off pickups that were modelled on the Geddy Lee sound. She was a beauty! Dot and bound neck and everything. I just never liked the way jazzes sit in rock mixes and the neck was a bit thin for me.
T-40s are incredible basses. I have two (one blade one toaster). I really don't know what to say about them other than incredible. I favour the blade because of the sculpted body shape, it has more bite too, while the toaster is warmer.