I'm assuming you're up against a Jonsered 2071 turbo (not 2170).
If so, it's gonna be a struggle. The 371xp platform is absolutely beastly. Even if you had the 70cc Magnum variant (which I believe disappeared pre MS380 rebadging), the Jred has you beat with chain speed.
I don't know if there's a big bore P&C available, but at the very least, you'll have to do some port work, and run race fuel.
The MS380 and the 2071 were designed and built for completely different end uses. The MS380 is a large cc farm/ranch saw. While powerful and reliable, it's a cheaper alternative to the MS440. The 2071 is a production logging design, with power and weight being paramount.
It is possible, however, you've got some work to do. Focus on details, and don't forget to run a sharp chain. Not "new" sharp, but really sharp.