OK here's the deal the ol lady isn't happy with the suburban anymore. She's concerned with the enviroment etc..... the burb's running real rich but I can't seem to to get te worn out quad to lean up. anyway propane is looking real good all the sudden. now it's got a 68 350 horse 396 10.250 compression stock. do you guys think I should throw that at her.its better for earth and all that good stuff. problem is money. 4 kids will take there toll on the ol wallet. I have to surf this site from work so I can't ask all the question i have right now.