It shows in the GM manual for 86 that it is one piece, but through a search it shows there were some two piece for 86? I need to know so I can order parts for a rebuild. Please help me!

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'86 IROC 5-speed
305 LG4
edelbrock performer rpm intake
edelbrock 600 cfm carb
msd pro billet hei distributer
'95 3.23 rearend
hotchkis rear suspension
PST front polygraphite suspension
"speed kills. buy a f@&d, live forever."

 

The chances of it being a 2-piece seal (if its the original block) are somewhere between slim and none. I used to sell parts and I never came across an 86 that was a 2-piece rear seal.
Easy to verify, see if theres an aluminum housing at the back of the block next to the flywheel. If so, its a one piece. Its usually painted black so you may have to take a close look.