Tough choice since you don't know the intimate details on either engine. If both engines are built correctly then either one would work. Personally I prefer the bigger engine with more torque but some people love the smaller engines with the super peaky power curve. Either combo can go fast and there are lots of examples at the track. Best bet is to talk to someone with a very similar car to see who they like for torque converters. Lots of people can make torque converters so I always tell people to find a vendor who they like talking to since you'll be talking to them a lot. It often takes at least 2 or 3 converters before you find one that really works for you.