caddy 500 swap ????

[Power Trip]

I am wanting to install a 500 caddy along with the tranny at one time. My truck has a low hump cab and a manual crossmember. Is it possible to install the auto tranny crossmember before the installation of the motor. The reason I ask is that the cab is not bolted down and I'm able to remove it completely. I figure it would be easier to put it in. Would I mount it in the original holes from the factory or would it have to be relocated ? Also the motor mounts, can I use the ones off of the caddy or should I buy the kit from MTS? If the weather would cooperate I could have a caddy in the driveway by the end of the week so probably more ?????s will follow. Man I hope I made cents Jim