New Member 5.3 carb going into 82 K20

[mhjs15]

I am new to this website and have a few questions. I Just got a 82 Chevy k20 I am planning on putting a 5.3 carb motor into it, right now the engine is sitting in my 95 S10. It is not running yet still waiting to get the MSD ignition kit for it. I plan on putting a 700r4 behide it with a 208 transfer case that is already in the truck. On another website once I was reading something about a spacer for the flywheel to meet up with the torque converter, do I really need one? I was going thru some pics on this site it looks like stock manifolds will work, if so is there any thing I got to do to get them to work? The last thing is I fold it once on here once but I saw some pics and cannot find it again of a front crossmember replacement and is it really need to be done. The only reason I am putting this motor into the truck is that my S10 I am giving to my stepson whats to put a 6.0 FI into it when he gets the money to do it. I am planing to rebuild this truck from the tires up.