look at the paint color on the injectors , its important I think orange and brown were off the 350 and yellow and blue were off 305's and the 4.3 l is also different but will all bolt up
look for ford pick up trucks ,they used that ratio ,very common ,but the pinion spline will be different and require a different yoke .I switch mine over ,and removed the 4.30 that came in mine. lots of them in 3/4 tone trucks.