wanting to use a suicide doors back half kit 53 chevy

[81chevyc10]

I was wondering im putting a s10 frame under my 53 chevy shortbed i want to install the suicide doors backhalf kit. but do to cutting off the end of the frame im not sure if it will work if anyone can tell me how much you have to cut off the end of the frame that would help thaks shane ive heard it was like 6 inches but i havent actually set down and measure everything up yet