well wont be that easy but if you can weld and do fabrication work then shouldnt be too much of a struggle for you, if its your 1st time attempting something like this then its going to cost you alot and be alot of messing about at a struggle, i think there would be two ways in which you can do it

1. fit the volvo engine and gearbox, which involves costom mounts and more then likely modifying the driveshafts/hubs, and all the usuals such as engine wireing loom mounting intercoolers, exhaust mods, maybe different feul setup etc

2. fit just the engine, costom engine mounts, i think the gearbox bellhousing will need to be modified no doubt to bolt on, shouldnt be too much trouble i would think if you can ally weld? modified flywheel and no doubt ive missed out other bits that will need doing