BIGS,
your motor is from a 73 B or E body.
It will have the wrong size shaft at the rear for a 1970 application.
The crank arm you have is correct ( 2822289) for 70.
You have 2 choices available. Your can either get a correct appearing motor with incorrect part numbers and date code
or a correct 3431077 motor like JS27N0B posted.
Those wire connections are a fire waiting to happen!
Call me at 450-656-5438.
I will help you out and it won't take a year. I am feeling better now.
Jules