Ive read the threads on the swap 99% where all auto. Mine is a 5 speed

trucks specs
99 4.3 4x4 5 speed

v8 goin in is a 02 5.3

I am having trouble getting a flywheel for this setup I know can use my original clutch assembly. Most threads I have read some say need crank spacer if its 01+ some dont so which is it and exactly what year flexplate I can get that doesnt require spacer. If someone can get me the parts #s that I need be greatly appreciated