Changing motor in G20

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I would like to know where i can get on the net or forum a detailed writing on removing the motor out of a G 20 full size Chev van . It is a Star craft conversion. Have work on older cars years ago I do know my way around a bit . Son blew up his motor and dear dad has to come to rescue due to low funs. I know it will come out the front so ihave been told . How long of job and how difficult is it . I know it might be a bitch . We got a motor out of 91 blazer runs good still in truck . What would i need to change ( computer , sensors, pulleys , fly wheel , tor ck converter ,etc. ) Thats where I'm am lost hate to put it in and not run .
Motor is 350 in van and in Blazer
Not changing trans.
Any and all info no mater how small or big would be appreciated

Thanks