I played the Slant 6 game for 10 years. I even had Doug Dutra build my motor with most of his speed secrets for them. It was a great running Slant 6, but it was still a 18+ second quarter mile car.
Save your money, tune your stock motor well and consider the following.
In the end, I pulled it and put a junkyard 5.9 Magnum with a 727 in my car. I set it up so I had EFI, and did the beer keg manifold mod with headers and a small cam.
I got 4 to 6 mpg better fuel economy, it was dramatically faster and it sounded way better.
I've since installed a 408 Magnum with ported Eddie's, a healthy hydraulic roller cam and hooked it to an Extreme Automatic's Stage 2 200R4 with a 3800 rpm lock-up torque converter and 3.90 gears. The car is like Dr Jekyll & Mr Hyde. gets 14 mpg around town, 17+ at 70 mph on the freeway and beat 2 Hellcats in the drag races at Willow Springs a few years back.
I will never go back to a slant.
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