Some missing,broke engine things-question's

I just noticed while checking the oil that the oil filter cannister has a broken mount, on the left side there is a pice of all thread screwed into the block that the filter cannister is bolted to- the allthread is sheared at th block, anyone have a pic of the way the factory mounted the cannister??
Second question is the back exhaust manifold bolt is sheared off, no leak just no bolt. should I just keep an eye out for a leak or undertake the nightmare of removing the exhaust manifold and extracting the sheared off bolt? opinion? (I hate working on the exhaust)
One more question, is there a fan clutch upgrade available for the
F head? I'd like recover some power from the direct drive fan I got now.

 

Personally I would want to pull the manifold and replace all the bolts but that's just the way I am. If it's not leaking it won't hurt anything to leave it. Keep in mind that if you do pull it there's a good chance some of the other bolts might break off too.

 

Yeah, thats almost gauranteed, thats why I'd like to wait on that one. Just wanted to check.

 

Just another added thought. When you do pull it I would take it to a machine shop and have them throw it on the giant belt sander to resurface it in case it's warped at all. It literally only takes about ten seconds.