95 z28

hey i have a problem, not too serious. but still a problem... i had a bad cat on my z28. i gutted it. but as im putting my y pipe back up to the manifolds, some of the old bolts stripped out. also i dont know yet but some of the studs may have stripped out too.

first... hoping its just the bolts, how do i get new ones? i know a hardware store but even if i take the old ones up there, they still are all screwed up...

second... i do have a torch, and a stud puller. but i have never used the stud puller, how???

third... where do i but new studs at? the ones ment for the car. (chevy)

 

home depot or lowes will have them, what are the bolts for ? is it an after market y or the stock one ? are the bolts into the block stripped or ?