1970 318 out of a camper??

Skip the 318, stay with the 360. Rebuild the 360 and install higher compression pistons and as far as a cam goes, a grind like this, 230 @ 050 / .480 + lift will make your targeted HP goal easy.
The 360 heads should be rebuilt with 2.02 intake valves and well prep'd. Add headers and your good to go.