bolts
 

i was wondering if iam spose to change and get new head bolts for a 86 supra non turbo after i did the head gasket, because some people told me that i have to because the bolts stretch

And they are right, get either new Toyota head bolts or many people go with ARP head studs or bolts.

and where can i order those?

the studs are supposed to be better, so ive read. you can get them ebay, horsepowerfreaks.com, suprasport.com, and prolly a couple other places but i cant think of them right now