Mark, if you have a henderson hatch in the bow area the date of manufacture of the tubes will give you an idea of the age of the Rib, because I think that it might be older that 94. Post 1992 consoles had the left hand side flattened off so a outboard control box could be mounted more easily. Also the hulls had a planning wedge at the back. That said at this age it matters not. You will need a mirror and a torch and you are looking for a hand written date of manufacture.
If you don't have a hatch into the bow area then fitting one is easy and give you a large dray area for storage.
The Evinrude 70 is a good choice for the hull
, should run about 4 gallons an hour at speed and probably give you 26 knots lightly loaded. If its RNLI then you need premix fuel for it.
She is cleaning up nicely.