Hi. This link is a good place to start.
http://www.luvtruck.com/pdf/EngSwap.pdfCheck out powerbyace.com - he has bolt-in mounts and headers.
It's not overly complicated. As far as engine swaps go, it's probably more straightforward than most.
The 72 rear has 4.56:1 gears. Depending on your goals, that may be steep for you. The S10 rear has 3.73s but then you have a 5 lug pattern in the back. ChevyToyR1 has a front hub redrill service that will match the front to the rear if you choose to go that route.
Speedway has a radiator that fits with a little work.
That should give you an idea of what you need to get started. Try the search button to see some specific builds.
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