First I'll say that I love the HW 5200. Second, don't expect better mileage. My truck probably weighs in at about the same as a Caprice; 3800 pounds, and the best mileage I've gotten is with the large ventura monojet that came on the 292s. I got 16 mpg on the hiway as long as I was nice to it and kept it under 65 mph. For any real increase in mpg you will probably have to freshen up the engine with new rings and bearings, go with a mild performance cam, work the ports over a bit, and run a split exhaust or header. That caprice is HEAVY so no matter what you do you probably won't get better than about 18 mpg. Lagndons sells a nice linkage or it's easy to fab one. Good Luck!
Boo
On second thought; with that knid of compression you probably don't need ringgs or bearings. how many miles are on this rig?
