https://www.youtube.com/watch?v=gyPI438nGjI
You needed a new fuel pump. The Javelin used a vaccum pump on the
fuel pump to operate the vacuum wipers if yoiu didn't spring for the
optional electric wipers.
I was an AMC mechanic in 1972.
Now the Chevies up until about 1957 didn't have this luxury - and
the wipers would slow to a halt on a long uphill grade, then go so
fast they'd throw a blade coming down the other side of the hill with
your foot off the gas. The #48 juice can repurposed as a vacuum
reservoir was almost adequate to keep the heater controls working, and
the hydrovac was good for ONE application of the brakes - but didn't
help the wipers for more than about a 10 second passing maneuver.


Clare - my brother had a Rebel "Machine" - I seem to remember
that it still had vacuum wipers ? ~ 1970 true ?

https://en.wikipedia.org/wiki/AMC_Rebel

I would DD before the term was invented, and take off from
a stop light in 3rd gear of 4 and be half way across the
intersection before realizing it ... geared LOW or what !
As far as I know it had stock rear end.
On a 401 round-trip from Galt to Hogtown - you'd need to gas-up.
.. 200 miles max.
John T.