Ok.. I'm doing a rebuild on my 350. My vehicle is a 92 gmc high top conversion van. I don't ever tow anything, and I'm not looking for anything fast, just something with a little bit of seat of the pants, but nothing really over 4000 rpm really, just looking to build a decent fuel economy cruiser. IHave searched, I have researched.. I haven't found an answer about cams because I want a roller cam keeping the computer stock. Even keeping the stock swirly heads. What are my cam options? Is stock the only option or....?