I have this engine. (5R07K252388)
Evan,
5R07K252388 was my 1st car, owned it from 1973 to approx 1976 when I sold-off the rolling chassis.
No current interest in it, but small world, no? Just curious about how / when / where it was found.
Past history: In early spring of '75, I started "ruining it": had the block bored +.030, & then painted it candy apple red before putting only ~6K miles on it. Too much cam & a poorly-configured valve train soon doomed it. Add a 17-yo hyperactive hack (myself) in charge of everything, & the rest is easy to understand.
Anyway, the entire vehicle was subsequently pieced-out & slowly sold over the years. Most of the engine components went to Ron Miller/Ford Power Parts, but this was long before he opened the Norwalk shop.
Regards, & many thanks for the trip down Memory Lane!