cant find a protecto plate and not sure how to tell what motor came in my car originaly. emblems are gon on front finders and it has a crate 350 in it now. but the radiator is harrison and it is a four core and wider than the small block demintions that i found. is there any way to tellfor sure what was originaly in it

Does the car have a big block heater core ? Next what are the fuel lines like, are they dual with the vapor return line ? Also, does the car have a tach, if so what does it read for a red line ?

not sure of the diffrence in heater core. it has two fuel lines with the returne comming from a filter up by the carb. it does not have a tach in the car.

A big block heater box has the heater hose connections in the center. A small block heater box connections are closer to the engine block