We had a Honda 90hp on the back of ours and I think we hit 32/35 knots but as it was our first 'proper' rib we did not use the trim at all as we had not yet had any training and were unaware of its benefits though we still returned excellent fuel consumption, as well as a problem with water getting under the deck and filling the hull up!
It did seem to feel stern heavy even without the water
and was very quiet despite the fact is was carburetted. Seating layout is important in the 620 having weight forward made a big difference.
The new 90hp Honda looks good with v-tec, try and get a 115 on it though it is the max as usual its better to have some there if you want it
If you want any pictures we've got loads drop me a pm and I can email you some.