I have one that you can use. Send me your email address and I'll send it to you. It's not mine and since RV-3Bs vary so much, perhaps it's not completely applicable to your plane. It's PDF format. Don't know where I found it.
I recommend that you download the POH for other RVs to compare them. I downloaded a handful of RV-4 ones and an RV-8 one. They all have different things included and varying amounts of actual test data.
Doug keeps a good POH page here on VAF.
It's quite helpful.