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

Two weeks ago I bought a low mileage 300hp 5.9 crate motor out of Riverside off of Craigslist, had been on there for months...I have disassembled it cause owner said the crank got nicked while upgrading the pistons and rods...going to get crank turned and put new rod and main bearing it....Got a good deal on it..
does not have stock magnum valve springs or valve seals on it either...

so they are out there...just gotta keep looking....