Just see about buying a smashed donor car from the junkyard less the engine and transmission then you can take your time of pulling all your parts. Then when you are done hall the remaining of the donor vehicle to a scrap yard and make some of your money back. It may be hard to find this setup if the engine has been removed though because most salvage yard just clip and cut when they remove the engine.
Do all blocks have provisions for a knock sensor?
Another thing to keep in mind is the egr system. If you don't want to run the egr you may have to have it removed by someone like www.tbichips.com
when I installed an aftermarket intake on my 93 k1500 I ran a tube from the passenger side exhaust header into the intake to run the egr. This does require an egr intake though