dont get me wrong a 7M can be done, its all about how much u are willing to spend and how much trouble u want to go thru...
some better options are the 1G-GTE (2 litre 6 cyl), or the 3S-GTE (2 litre 4 cyl), these engines will fit into the engine bay much easier than the big lump of 7M... but if u still want a BIG six in the engine bay a 1JZ-GTE (2.5 litre 6 cyl) would be a a better option than the 7M..
anyhoo check out the tech articles, and do some searching around the forums for some info on these engines, dont let me dissuade u if you have your heart set on a 7M, but if u want simmilar power for less trouble, then check out the 1G and 3S...