There is a direct bolt on that will fit the hole in your firewall.
I have also always toyed with the idea.
Just find a:
1976-1989 Plymouth Volare, Dodge Aspen, Chrysler LeBaron, Dodge Diplomat, Plymouth Gran Fury, Town & Country, New Yorker, or Fifth Avenue.
Some of them came with intermittent wiper systems.
They look like the early 2 speed motors but have 1 extra terminals on the motor where the harness plugs into it.
Of course you will need the switch, delay control box/harness and I would say the connector that goes on the back of the wiper switch itself.
With that said....I think the only "bolt In" part is going to be the wiper motor.
Link connecting your 2 wiper arm pivots should be fine but the one going to the drivers side pivot from the wiper will almost for sure have to be modified.
As for a wiper motor crank.....this is why I think the link connecting to it will have to be modified but maybe not....they came with the plastic press in bushings.
I'm almost sure that there is a bronze bushing style crank that will work but never have gotten around to trying all the different ones I have.
I will try and dig some pics up.
Hope this helps
Jerry