Maybe it would help to know the rest of your set up? I ran an 865 with a 144, b pipe, enhancer. It did well being in a carbon hull. The next season I upgraded to a 155 pump, PFP, and Zeeltronic. Felt like a completely different engine.
Edit:
Reason I’m wondering your set up is to know if you’ve tapped out what you currently have. You may be surprised. Plus, it may not be very beneficial to go larger if you don’t have the mods to support it yet. That is, unless you are planning on upgrading all at one time?
Another huge factor is the hull? Unless you are just super pleased with what you have, have you considered swapping hulls. A new hull can make that engine feel a lot bigger as well. I’m not trying to talk you out of upgrading engines though, just seeing if you’ve considered all options? I find it hard to believe a 148 wasn’t worth it.