About that black vinyl strip at the hull deck joint:
If you are going to be doing a lot of fiberglass work on the boat anyway, you could think about removing that strip (if possible) and putting glass seam tape on the outside. It will make the boat a lot stronger.
However, your boat has held together well 'as-is' for quite a while (30 yrs?) so it will probably be OK for a few more!

Fixing up an old boat can be a big (and expensive) project- it won't take long to get up to $500++ if you don't have materials 'on the shelf' in your shop.- you should sit down and consider whether it would be smarter to get a used boat in better shape and pass this one on to a new owner. You do need to replace that front hatch cover in any case so you can do that right away.

On the other hand, it can be rewarding to make something 'new again' and you will learn a lot in the process.