You could just run it and see what breaks. I think you'd be ok with the Dynamite engine or 3port SH engine. The 8port and .32 are going to add a decent amount more power than the stock engine. I had no issues when switching from the KE .25 to the 3 port SH .28, though there was a power...
As to the original question. Like mentioned, the Dynamite Big Red .28 is a really good option, it will have good power. The SH .28 P3 is another great option, both have roughly the same output, with the SH being a tick less.
If you go the LRP .32 or SH .28 P8 route, you're absolutely going...
I was checking up on Novarrossi, can't seem to find any info on them that is recent, no updates in some time. The speculation was that they would re-open after the pandemic, but nothing yet thus far. Remaining hopeful, or that they'll see their equipment and allow someone to keep making them.