1963 Plymouth Valiant Signet Convertible Restoration...HELLLP!!!
I agree with the others...put another slant in there while you gather the correct parts to make a proper V8 swap. Things like the cable operated V8 trans will be hard to find, the center link, gas pedal assembly, headers, radiator, and other things will take some time to save for and round up as well. Procar1 has done this swap in a 63 Valiant with his son, maybe he will chime in with some tidbits!