The measurements i referenced were out of the assembly manual for 55-59 chevy trucks. I guess the dimensions are for trucks other than 58. The dates on the drawing are 54 original date. 56 rev date.
I found a frame for a double headlight apache which should be a 58 or 59. The guy selling it measured the frame at 178”.
Is there a 58 specific manual?
Thankyou for the info. Glad I didn’t bite on that frame.