Thru bolt hull to top - advice wanted

[abl1111]

Thanks guys. I now have a clearer picture of what I will do. It's a little bit of what each have said - w/ Hermco leading the way !

One question: is it really a concern of the hull-cap joint shifting if I pull all the screws out at once ? Pulling all the screws out at once makes the grinding and glassing that much easier - I can do it all at once w/ nothing in the way.

What sealant is in the joint now ? ( manufact in 1975 ) Should I pull this sealant out anyway and replace with the newer 5200 ?

FYI: I have no leaks in the hull joint at all. I just feel that the SS screw need to get replaced, they have been bleeding rust on the inside liner - and I want to R/R them and add SS bolts... Glassing is a possibility, but 1st I need to see how EZ it will be to get a grinder in that tight spot...