I just bought my first K5 - an 84 4x4 with a 305 in it. I'm seeking some advice from anyone that has knowledge about what i'm going to ramble on about.. First off, I'm looking to get dual exhaust because I know the exhaust it has now is cramming down on any performance I might be able to get out of the 305.. Are there any dual exhaust systems available for an 84 blazer? If so, where? I'm also going to buy a 454 engine for $300, and it's out of a '76 or so truck. It runs fine and I'm getting a deal because it's a family member - but would this be a wise choice to throw into a blazer? I'm also looking for the best lift and tire size for the use of my K5. I'm going to use it mostly on the streets... but when I feel the need for offroading I want the clearance to be there. In your opinion, what size lies on the line of best street handling and best off road handling? And the last thing i'm going to seek advice on for now is the rust I need to take care of. The drivers side rear panel has many large holes in it, and it's rusting from the wheel well pretty bad. Should I just grind it out and weld new metal in, or is there a better way to go about this? I know I'm going to come off as a newbie, but that's because I basically am when it comes to this. Any advice would be greatly appreciated! Thanks.