Need help TDC bring up #1 piston

[72CSTC5]

Okay, here I go again. A while back I had a thread about installing HEI. Well, after scoring around pick and pull yard in a 100+ degree heat in Texas my dumb butt looked on ebay and found a complete new unit for little money. Wasnt worth the aggrevation of looking for a used one. Now I need help on bringing up the #1 piston. I have read on here to pull the plug and put a paper towel piece of paper in there and when it shoots out you are there. Well my dumb question is will it suck itself in on the downstroke of the piston? Dont want to create a mess here for myself. Again, I am KING at bodywork but this mechanic stuff is for the birds but trying to build this truck low buck.
Carlos