360 LA Block Questions

I haven't posted a dumb question since my last post, so here it goes:

I have a 360 LA core that I want to take to the machine shop and get checked and machined for a rebuild. I was told the engine came out of a van. I've seen some comments about truck blocks, is there a difference in the mounts for truck blocks versus the mounts on a a car block? Will I need to be aware of any differences between truck and car blocks before I take it to a machine shop and start spending money on it? I'm planning to use it to build a motor for my '68 Dart that currently has a 318 in it. Will I need to replace the engine mount brackets?
Thanks in advance.....
K.C.