Howells, who has coached at Pontypridd, Cardiff, Celtic Crusaders, Edinburgh and as a caretaker with Wales, doubles as the Romanian national coach and as the head coach for Bucharest Wolves in the Amlin Challenge Cup.
No fewer than 16 of his match-day 23 were from the Wolves set-up and were able to produce a win over a side ranked six places above Romania in the IRB World Rankings. Next on the agenda this autumn are Canada and Fiji.
"Romanian club rugby isn't of the highest quality, so getting the best players together to play in the Amlin Challenge Cup is vital for us. The European tournament provides us with the kind of pressure and intensity we need to prepare our players for the international stage," said Howells.
"I simply don't know what will happen to our game if we don't have the Challenge Cup next season - the tournament is huge for us. Beating Tonga was a fantastic achievement, but we would never have been able to do it had we not had matches against Newcastle Falcons and Rugby Calvisano last month.
"Those games were a vital part of our preparation and gave the players the belief they could play at a higher level. Now we have to go on and prove it again against Canada and Fiji over the next two weekends.
"We asked for these fixtures to help us prepare for our World Cup qualifiers in the New Year, when we have to win at least three of our five matches against Portugal, Russia, Spain, Belgium and Georgia."
The Wolves were cruelly beaten by a last gasp penalty against Newcastle Falcons, but proved too strong for the Italian side as they ran in three tries in a 37-15 home win. Next month they have to face Top 14 side Brive in back-to-back matches.
Skipper Mihai Macovei grabbed the Romanian try and the rest of the points came from the boot of Wolves centre Florin Vlaciu. Exeter Chiefs wing Fetu'u Vainikolo crossed twice for the Tongans.