All for .370 lift and under ........

Dale Davies said

I would be inclined to either change rockers to a higher ratio or swap the cam to a short duration high lift cam. 107 or 108 LCA for overall performance 210 to 215° 0.050 lift duration, 256 to 264 seat timing and 0.450 lift.
For that brick you need high torque at your cruise RPM which probably close to 2000.

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Sorry coach, duration. Basically an "RV" cam but today the shelf cams tend to be ground with either 110° or 112° LCA. According to David Vizard's 128 formula to calculate cam LCA and considering a 1.88" intake valve, optimum for the stock stroke 318 would be about 105° LCA. Idle may be a bit lumpy, so that is why I stated 107° or 108°. With a somewhat heavy and boxy van, low RPM torque is required, so giving up a bit of idle smoothness for better fuel mileage and torque between 2,000 and 4,000 RPM may be good to consider. Looking at Summit or Jegs for hydraulic flat tappet cams, the prices are fairly reasonable even with 16 lifters. Here in Canada we are adding about 30% to the cost plus shipping.
If the cam gives a mileage increase like I got in my 82 Blazer with the low compression 305 (+3US MPG) and todays fuel costs, that expense would be fairly quickly recouped.