this would be a cool swap.
I think on the ozrodders site there are some dimensions.
also check out the 1UZFE site.
http://www.lextreme.com/forumsi think you need to change the sump and that looks fairly involved or expensive if you buy a "conversion" type set up from one of the conversion shops.
Also engine mounts require some crafty thought.. I think there is an EH with a 1UZFE on the lextreme site and he made some motor mounts to adapt Holden engine mounts.. as I said.. crafty!
The donor of choice appears to be a front cut Crown and you can mate up your gearbox of choice. If you use the std gearbox then you will need to ECU's one for motor and one for engine. I gleaned all this info from the net and reading other peoples write ups on conversions in the hope to do it myself one day.
apparently the motors are very wide too..
Cheers
Ed