Trying to start a build, where is the best place to look for a motor?

 

I'd suggest a local Auto Recycler may be able to help you (and it saves the shipping costs of sending a boat anchor across the lower 48)!
If he doesn't have what you need, they subscribe to a locator service and can have a low milage unit shipped in.
It's either that or you can try:
http://www.woodfins.com/FindParts.asp or
https://www.cherry-auto.com/

or even EBay is an option....just don't say I didn't warn you :-)

P