Dave, I hear ya, but I personally doubt the 45 fewer CID would have a super significant effect on economy, especially if you used a fast rate roller hydraulic in a roller teen block. you're probably fine with the .030-.033" quench the MP gaskets will provide, especially since I doubt this engine is/will be revved past 5k.

4speeds, if it were me, I'd slightly sacrafice mileage for power and use something like this cam, with mag heads, since they flow so much better than the 302's, and I doubt they'd have much hit in economy.

http://store.summitracing.com/partdetail.asp?part=LUN%2D60710&autoview=sku

if you were more economy minded, I'd go with something like this:
http://www.hughesengines.com/partDetail.asp?partID=11409&eTypeID=1