Even the 428 Cobra Jets had dished pistons, and they had 10.7-1 compression. How deep is the dish on the current pistons? 390 pistons won`t work, as they will stick out above the blocks deck surface. Different compression height. On the regular 428s, and possibly 410s, the dish is deep enough that the eyebrows basically disappear, on the CJ pistons, the eyebrows are fully formed all the way around. Unless they have a deeper than OE dish, depending on the cylinder heads used, you should be at least 9.5-1 compression, don`t know if you really want to go a whole lot higher for a pump gas street engine with a mild cam. I have the FPA headers on my 59 Fords 428, and although rather pricey, they fit really well, and are much better than the typical log exhaust manifolds needed for these applications. Plus the FPAs do not hang down low, or dump into the stock transmission crossmember, like most other headers seem to on these cars. Headers,cam, and intake & carb can wake these engines up pretty good. What is his intended use for the car, and transmision and rearend gearing?
