Another day, some more (slow) progress.
My custom Magnecor plug wires arrived yesterday. 30" length, 90 degree HEI "top post" style boots for the coils and straight boots for the spark plugs. I also got two sets of their wire separators. Considering the decent wires and terminals and the proper crimping tool/dies $110 really isn't too bad of a price.
These are their 8.5 mm "KV85 Race Wires."
Magnecor makes a lot of claims about their wires and EMI/RFI interferrence but I don't know about all that. Either way I've had good experience in the past and their super easy to work with.
THe 30" length was somewhere between a measurement and a guess. I used some old vacuum line to approximate the route of the wires. Fortunately my guesstimate was spot on this time.
Another angle:
The wires are held in place at the fuse box with a little bracket I made out of 16 ga steel (is in the process of being painted):
Overall I'm pretty happy. The wires just barely contact the brake line for the driver's front caliper but other than that there is ample clearance to the alternator and steering column. I tried to route them so they cross everything else at 90 degrees and I pretty much accomplished that.