You are overthinking it. Just get some soft copper flat washers of the right thickness with the bolt hole dia correct (larger dia for the pedestal that feeds the shaft) that will easily conform to the saddles, mock them up & get the straight line @50% then check the wipe pattern. The wipe pattern is more important than the straight line but get the straight line 1st and If you are feeding the shafts up from the cam I would consider oiling in horizontally from the back of the heads then angling up to the rear pedestal and restricting the crank to cam feed passages w setscrews w a 1/16" hole drilled in each one which is plenty of lube for the cam bearings/journals but one problem at a time.