I have owned about 8 of these cars since 1990 and extended cranking is not normal. Especially with my current white GN starts in a second or less my current blue one 3-5 seconds. Here is a vid of an 86 that I did a buy fix and sell; stock starter and 42lb inj. starts in 1.5 seconds.
Here:
At 0:14 a=started by 0:15