There was no Max Wedge after 64. 64 was the introduction of the race Hemi. A 62 Max Wedge was a Stage I and was 413 c.i.. They had a slightly different intake and carbs with smaller venturis than the Stage III. They also had bolt in rocker stands. Stage II also had the bold in rocker stands and both I and II had 4 bolt valve covers. Stage III had cast in pedistals and 6 bolt covers. They were 64 only. 63 and 64's were both 426c.i.
Maybe I'm not explaining it well. So go here and read it. It's a good site.
http://maxwedge.com/orangemonster/orangemonster.html
http://racehemi.maxwedge.com/topics/heads.php
... ok lets start over.....stage anything is a nick name,,as is the street wedge. the real names are different between dodge and ply.
ply being the most popular i will go over them...
now this is some fact... and some are nicknames ..i will try to show the diff.
1962 413 max perf wedge....factory name ...nickname super stock413
no stage anything
1963 early 426max perf wedge. factory name
1963 mid year light weight cars and some cyl.head changes
factory name .... super stock 426 11
this began the stage name referances.... all nick names
1964 factory named ...superstock 426 111 ply.
ramcharger 426 111 by dodge
even more confusion cuased by two different compresion motors in each year....
1962 413 ... 11.0 comp....410 hp
413 ..13.5 comp 420 hp
1963 426 ..11,0 comp.. 415hp
426 ..13.5 comp... 425 hp no mention of early or late 63
1964 426...11.0 comp... 415 hp
426...13.5 comp.....425 hp
.. a lot of confusion was in the low comp motors ...and many refered to them as a street wedge ....and the stage two ...for the hp level being one down from the max wedge.....
never having a real name for the 426..365 hp single carb motor ....they were offen refered to as a stage 1..as in the lowest hp of the 426 wedge motors.....
so it is alot of perception, and even changes from the part of the country you live in...call them what you will ...they are one thing for sure ...ma mopars bigest step into history....
thats the best i can do without digging back into paperwork that goes back 40 years.
ma mopar also put out a bunch of odd balls...so you may find a "one of "in most any of her lines