OK Rain, have you got this figured out yet ?
Here is my take, put the performance 318 in the Valiant Wagon, it will make a whole different car out of it.
For driving it on the street you are going to want to swap in the "Mopar 340 Cam" to use with that .030 over higher compression 318.
Great street manners, performance, and a great idle. You will love how that runs out.
That cam in there now is for racing and you will not be happy with it in the Valiant as a drive it around street car.
Melling makes a duplicate grind 340 Cam called the SPD-22 same grind specs as the Mopar Performance 340 cam, and it is less than 1/2 the price of the MP Cam. Melling makes good engine components, get the Melling lifters to go with that cam too.
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1970 318, .030 over with 340 Cam pictured here, imagine that.
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318 and never look back . . .