Unless you have made a piston change, you most likely have cast pistons. I would not venture beyond a 100 horse shot with those babies. When you use it, pull out 2 degrees of timing for every 50 horse, or a total of 4 degrees. As mentioned before, you should also consider moving up to a performance type mechanical fuel pump, or better yet, install an electric pump, to feed the mechanical, and use a regulator with fuel pressure gauge so you can set the pressure. One other thing to check on the car are the spring perches. Even at a hundred horse, that 30+ year old metal (and I speak from experience) will rip right out. Box weld them if you can, it's a cheap improvement. Lastly, if you go to the track, install a drive line loop.
Ron
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