Are you kidding? You think the old 70's tracks are as fast as the mondo ones of the last 10 years? The big improvements in the WRs in most events is not just down to PED's and improved training. The tracks are quicker today, or else they wouldn't keep replacing them every few years.
I'd say the Oslo track in 2010 is more than 0.1 faster per lap than the one used in the 70's.
As for pacemakers. There are a few guys now that can tow the likes of Rudisha close to 600m in 75.0 secs, just as there was for Kipketer in 97. There wasn't really anyone capable of wanting to try and reach 600 in that time in 79, let alone capable of it.
And your point is!?? God you're stupid
Firstly, let's look at some of those women, all of whom were from the Communist block, where it is now proven there was state funded and monitored drug programmes in operation in the 70's and 80's. It was propaganda and an extension of the Communists' identity and desire to prove it worked better than capitalism in the West.
Kratochvilova ( have you seen her body? ) - had only run 3 800m races before in her life, don't think below 2:00, then runs a WR and improves by 6 secs + at the age of 32!
Olizarenko - pb of 2:03.3 at age 22 (same age Coe broke WR). At age of 24 improves by 4 seconds in 1 season from 1:59.8 to 1:55.8.
Kazankina - At 24 has pbs of 2:01.7 & 4:05.9. Then in 1 season improves by more than 6 seconds in the 800m (1:55.0) to break the WR and 10 seconds in the 1500m (3:56.0). Then of course she's later banned for failing to take a drug test.
Mineyava- At age 27 has a v. decent pb of 1:57.8, then improves by 3 seconds in Olympic year to 1:54.8.
All the above would not have submitted to out of season random testing. All were obviously (?) women, who are far more responsive to the use of steroids ( the PED du jour at the time). Why do you think the Russians and East Germans were able to dominate practically all the women events and men's field events, while they produced no decent middle or long distance men?
Perhaps because steroids would have little effect on helping middle and distance men.
How many Russian female middle distance runners have been banned for drugs?
Then compare to how many British male middle distance runners have ever been caught using PEDs? Despite the fact the likes of Coe, Ovett and Cram would have undergone random out of competition testing from 1981 and out of season testing from 1985. Many years before other National federations or the IAAF introduced such measures.
Secondly, lets now look at Coe's progression.
1977 (age 20) - 1:44.95
1978 (age 21) - 1:43.97 (47.7 400m pb)
1979 (age 22) - 1:42.33 (46.8/45.5 relay)
..... 1989 (age 32) - 1:43.38
He had a long career sustaining high standards and running fast times over many years. His annual progression shows no obvious "jumps" like the Russian ladies listed above.