I don't have any experience with the new port wiper motors.
They just look like they will work.
I see you bought one of those new ports.
The other option -------.
There is a member on here twouvakind
that builds delay wiper system
sometimes. His last response was 9/12/18
on his product thread.
http://67-72chevytrucks.com/vboard/s...wipers&page=13
I will have to drill for my air system also I picked Old Air.
I would like to see pictures of your installation if you have time to take them and post.
I know about the over time stuff.
I will also buy the new port wiper motor.
Please post details of your installation.
.