No major changes, although Ford did recode the casting number.Appart from the first four bearing 200 in Fairlanes and Cometes, the 3.3 USA market engine in seven bearing form never really changed asside from the casting number puched or cast into the crank. Your all good. All were cast iron, eight counterweight in line 3.3 cranks the same from 1965 to 1983. Interchangable. No counterweights on cylinders 2 and 5.
IIRC, The Crank code stamped on the post 1980 - 1993 B and X code engines is different to the earlier ones. 2M or 3M or some such.NHRA has crank casting codes somwhere. But the crank has the same thrust bearing and crank and flange dimensions as it did in the four bearing 200 's in the 1963 Fairlane and Cometes. The last X code 1983 crank is still designed for a rope seal. And to the last day, the engine had two versions....high mount starter with C3, or low mount starter with C5 lock-up clutch. The only difference was the block casting code, and the kind of auto gearbox it came with.
The little Ford in lines six cylinder cranks were lowest tier in line six technology, always cast nodular iron, and It still missing even the 12 counterweights you'd find on a 1955 Nash in line six, and any 3.8 0r 4.2 AMC, or or 4.2 or 4.0Jeep crank...or the Aussie 1980-1986 3.3 liter OHV Blue and Black XT5 or XT6 engines. The Ford 3.3 seven bearing crank only has eight counterweights.
The decendants of the 3.3 were the eight counterweight 3.2, 3.9 and 12 or 8 counterweight 4.0 Overhead cam Aussie in line sixes, and they only got a fully counterweighed 12 counterweight crank in one version, the 4.0 liter EF Falcon from 1994 to about 1996.
See
viewtopic.php?f=5&t=74799
Then Ford went back to a lighter, IIRC, 8 counterweight version in the EL Series 2 late i 1997, and kept it for all the versions untill the engine died in 2017. You can make 1650 horspower without a fully counterweighed crank.
In 1994, the EL crank got reworked to 12 counterweights (Holden XT5/XT6's had 12 counterweights in 1980, so not cutting edge). Before that, all seven bearing Ford small I6's have had 8 counterweights since 1960 to 1993. The harmonic balancer was changed to a two element item.