I think the 350/350 would be the best deal as well. You will have a lot more buyers available for that combination because there will be less in it so your price for the car will reflect that. The 454 would come off work you have done so that would be a trade off, but I personally would consider the gas expense before buying it. I like to drive my cars which means I need to afford the gas. With the Ls1, it might be hard to get your money back.