Need advice on where in So. Cali. to find an LA360/TF to swap into my 65 273 Valiant

I'm thinking of swapping out my 273/904 for a 360/TF into my 65 Valiant and not sure where to look for a good engine/trans at a fair price. I live in Ventura County. (Simi Valley) Any tips are appreciated. Thanks, Litz