The Ford 600 lifts 1/2" higher than an 8N. I had to make lift arm extenshions 1/2" longer then the 7.5 standard extesions for a 50's design Dearborn 14-16 sickle mower, so the relief valve wound not squel. The 14 16 uses a sliding solid top link, which is also an option for extending the slot. Not lifting the lift lever to top length is also a simple option.
I also modified the PTO for the 1 3/8 PYO. TSC sells a 1 3/8 snap couple for Fertilizer spreaders ( replacement drive shaft only) that has a square slide 7/8" X 3/4". I had it machined down to 3/4 X 3/4" to slide into the female end of mower. I had to cut 1" off of the mower square shaft because of the added length of snap coupler. And cut 3/4" X 3/4" to length. Now I have an OSHA conpliant PTO drive shaft with plastic free spin cover. Old models used a sheet metal bolted to sway chain bars to keep hay from winding around shaft.
Why does the 600 lift higher than an 8N?