Widths look the same, hard to get a good measurement with the engine still in the ‘61 but looks to be 23” where the crossmember mounts to the frame. Word on the web is, ‘63-‘87s will bolt into ‘60-‘62s, an extra hole needs to be drilled another elongated. I’m referencing these links for this build:

http://67-72chevytrucks.com/vboard/showthread.php?t=366828

https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1154798/73-87_Chevy%5CGMC_front_suspensi.html

https://www.google.com/search?rlz=1.....0i71j30i10j0i8i30j0i8i7i30.cBEJo5G38Bo








1961 Chevy Apache 20 Crew Cab Stepside
-235ci inline 6, Carter YF2100S, SM420, Eaton HO52 w/ 5.13 on 35" BFG Baja T/As-
"BamBam"
In the Stovebolt Gallery
More pix in Photobucket