Any water finding it's way through the bulkhead tends to drip at the lowest point but could be coming in elsewhere. Places to look, the grommet where speedo cable enters and hairline gap between the scuttle ( under the bonnet tape) and ash frame, in both cases seal with loctite premium silicone available from halfords for £6, it's much finer consistency than bathroom grade. If sealing the gap under the scuttle run a strip of masking tape above and below the gap
