front end swap questions. needing help

[thunderkiss65]

I just swapped the front end out of my 65 c10 for one from a 83 chevy (which was easier than expected) but I have a couple questions. I have a 350 that I'm going to be putting in it and Im not sure which motor mount plates to use. The ones from the 83 dont fit quite right in the 65 frame and I also have narrow mount plates and some wider ones. What have you guys done? I've seen some of the people use the later model power steering box on the 60-66 models and they use a bracket to mount it up. Where can I get one of those from? classicperform.com? Any help would be great, thanks.