My 77' 4x4 had a 300 in it and I put the perches back in when I put the frame back together but I'm going to be building a 400 for it. I'm wondering if frame perches from a 78 f250 4x4 with a 400 would work in my f150?

 

I know in my 79 they worked just fine,had to be moved. I do not remember what holes it used. When you get ready to put them in,get with me and I will check for you if needed. Jeremy