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Welcome from Northern Illinois. I don't know to much about the LS engine swap but other people on here do. Great truck to start with and with all the NOS parts it sounds like you are going in the right direction with your build. It will be interesting to watch your progress. I have a Sierra Grande as well.
Welcome from California. LS engines are like small blocks. Block size is the same, bore and stroke is different depending on displacement.
Howdy from Kansas. Sounds like an interesting project.
Welcome from CO. Should be a fun project. Where are you in MT? I went to school at Rocky in Billings and my wife is from Eastern MT.
I'm a huge fan of trucks with a cool family history behind them.This will be a great project to follow.What kind of rims did it have back in 1986?