I asked in the haltech section but I realize that was the wrong spot, so lets try here,

I've got an E6X and an RE motor waiting to be rebuilt, I'd like to convert my CAS/multibelt front end on the RE to the hall effect front end of the REW... what I'd like to know is what parts are required for this ?

a front cover from and REW obviously
replacement E shaft pulley with timing wheel..

but what else ?? does the PS and alt need to be changed for the REW belt offset ?

 

i couldn't tell you but good luck in the search... i know there's lots of guys who put j-spec re's in their fd's because they are cheaper, so it might be reasonable to assume that if you have both motors there, you could probably make it work.