I didn't respond to the OP, since there were already good initial responses. But re-reading the original post, I feel it would be helpful to provide a complete response that clarifies the major principles the OP said he "knew":
1) All runs should be done at a steady state pace (NOT TRUE)
2) The ideal peak mileage for base training is 100 mp week (IDEALLY, BUT REALITY CAN VARY WIDELY)
From a 1990 Osaka seminar, a presentation given directly from Lydiard:
"I found that (when) we ran about 160 kilometers (=100 miles) a week in our main training sessions and jogged in the morning, six mornings a week up to an hour(2), the we got the best results."
(2) Footnote from Nobby: These morning jogs are recovery jog at easier effort.
So for Lydiard's "elite" runners, they jogged in the morning, up to 6 hours each week (up to 50+ miles), and this did not count towards 100 miles of "main training".
A typical example of "main training" during the "Aerobic Conditioning" phase (taken from a 1999 Lecture Tour by Arthur Lydiard):
Monday 10 miles (15km) at 1/2 effort over undulating course
Tuesday 15 miles (25km) at 1/4 effort over reasonably flat
Wednesday 12 miles (20km) at 1/2 effort over hilly course
Thursday 18 miles (30km) at 1/4 effort over reasonably flat
Friday 10 miles (15km) at 3/4 effort over flat course
Saturday 22 miles (35km) at 1/4 effort over reasonably flat
Sunday 15 miles (25km) at 1/4 effort over any type terrain
So you can see, all runs are NOT at "steady state" pace, but include a variety of paces, distances, and terrain. 10 miles at 3/4 effort could be called "steady state", but 15 miles at 1/4 effort would be more like marathon pace (or slower).
But this is an example of what Lydiard did with his "boys". Lydiard found that 100mpw was bad advice, for slower or younger runners, and changed the recommendation to time based. From the same seminar:
"Talking about aerobic development, we found that if we work on the time basis rather than mileage basis, we got better results, particularly developing young people."
Here is a similar example, based on time (also taken from the same 1999 Lecture Tour by Arthur Lydiard):
Monday Aerobic running 3/4 to 1 hour
Tuesday Aerobic running 1 to 1.5 hours
Wednesday Run hilly course 1/2 to 1 hour
Thursday Aerobic running 1 to 1.5 hours
Friday Jog 1/2 to 1 hour
Saturday Run hilly course 1/2 to 1 hour
Sunday Aerobic running 1.5 to 2 hours
So regarding the ideal weekly mileage in Lydiard training, the best answer depends on the individual in training. Young runners might run as little as 46 miles per week (or less), at a variety of paces, while national class runners could run as much as 150 miles per week, at a variety of paces.
Is Antonio right about 100mpw? At a first superficial glance, it might seem so, but once you gain a deeper understanding, by reading more than 1 quote out of context, it's easy to see that Antonio draws the wrong conclusions about the relative importance of 100 mpw:
Lydiard recommended to the Japanese, up to 100 mpw main training plus up to 50+ mpw supplementary morning recovery jogs (150+ mpw)
Yet for young undeveloped runners, they can run as little as 5.75 hours per week (46 miles per week at 8 min miles), up to 9 hours per week (77 miles at 7 min miles)