Quoted:
he wants it original so none of this smartass stuff! okay?
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Oh, one of [i]those[/i] guys.
Seriously, if you want to find one quick, Hemmings motor news is going to be your best bet. They have listings for almost anything. Just be prepared $$$.
I don't know if anyone is making an aftermarket flathead block or not. I'm not real up on my flatheads. A lot of the streetrod guys are using them, so you might look through the back of Streetrodder magazine or an equivalent.
The bad thing about a flathead is that they are so damn old, cores are drying up, and they are so prone to cracking, most of the ones you find are in the same condition as the one you got.
Good luck.
P.S.
Not to be a smartass, but tell your old man a 502 BB chevy crate motor will run a lot better and be cheaper than a rebuilt flathead.[:)][:)]