I would ditto all IIIcorps said and add that several 20's and most 35/36 have some sort of Nav systems, many dual KNS or UNS. The plane had quite a few quirks which current engineers would find below acceptable standards, but like the fogging of the windows most were nuisance and not a true safety issues. On the other hand, she did demand your attention and prefer to be flown correctly; certainly not adverse to being a little *****y. I didn't fly the 23, but the 24 was a blast, aside from always being out of fuel. It was a great comfort to be able to hit the loud levers and get out of Dodge at 6000 FPM. On the V1 cut, I was taught to keep her on centerline on the ground untill I was sure, and it worked, although my engine failures occured at cruise so I never got to truly prove the technique. .