I just picked up a numbers matching, un molested, 1970 Impala 2 door notch back with a straight 6 and 30,000 original miles. The research says there were only about 6,000 of this configuration compared to 600,000 V8's. The car is fairly rust free and straight, but the interior is trash. It needs work no matter what. The simple question is, is it better to restore to original because of the low production, or build it the way I would like since it is just a 6 cylinder? I want to try and squeeze a 454 into it, if I wouldn't be ruining the value. Thanks for any feed back!