B series in a 61-62 Valiant?

Not sure about made to fit the poly 318. If you are skilled enough anything is possible. The 60-62 valiants have a large box (heater core) -- inside the engine compartment, 63 does not have this-- but the firewall is slightly different than the 64-66 cars & much different than 60-62 cars.
I didn't save a picture from the 63 but the attached is from a 1962 valiant-- 60-61 are very similar. Lawrence

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