Got a 93 4.3vortec just got my magnaflow exhaust put on sounds nice except now i hear my donut gaskets and i think the rear of the manafold is actually leaking. here is my problem my truck is from up north.... (rust) it looks like there isnt much left for the threads on the studs i am worried about breaking the stud or not being able to get them of and back on any suggestions thanks in advance??

 

PB blast, possibly torching them before removal, anything you would normally do to remove a stuck bolt/stud