Small block gas mileage DD magnum/LA ?

Per post #1
Or should I use a LA 318 (which I have 1986 truck engine)
Per post #9
Just was not sure if the 5.2 magnum would be a better choice....or 318 ? I do have a 1986 truck 318 (roller block engine)
per post #27
the 1986 truck 318 has a roller block...but not a roller cam.
pr [post #39
With all this information, it looks like the 1986 truck 318LA might be worth keeping. I also found out it may have 302 heads +++.

I took a stab at it