Okay guys, I am just trying to squeeze alittle more gas mileage out of my '86 stock Blazer (350) for the 30 min trip to and from work everyday. I have alittle extra cash coming and the "better half" says I can either buy a set of shorty "smog" headers OR a Crane HI-6 ignition system w/external Fireball coil......but not both. Sooner or later I'll get both, but not today. So, which would you do? I already have a 3" CarSound CAT and 3" single exhaust w/Dynomax Race Magnum UltraFlo muffler (straight-through design). The ignition is bone stock coil-in-cap HEI w/8.8mm plug wires. I have run Crane HI-6 ignitions in the past and loved them 10x over the MSD 6A-L.... especially the rev-limiters. The rest of the Blazer is nothing special. 33" tires on 15x10 M/T Classics, 4.11 posi gears, 700-R4 tranny, and the gutless stock 160HP 350. I had considered switching from my clutch driven stock fan to a electric fan setup, however I worry that an electric wouldn't be enough to coil the SBC 400 that I have in the works, especially with the A/C blasting in the summers. The new 400 will have a set Pro Topline (iron) heads to max HP and TQ output. When completed it should double the HP/TQ of what I have now without upsetting the "smog nazis" here in Cali. A high volume water pump will be added at that time too. I also wondered if an open element air cleaner with a 6-8" filter would yield any mileage gains. Please keep in mind that I live in Cali and I get bi-yearly SMOG checks as well as the time to time checks for mods by the local cops. So please keep you suggestions under what can and can't be done with Cali emissions equipment/standards.