Like others have suggested the pistons are available. All it takes is money! My 57 factory ford tach drive dizzy has been converted to full mechanical and is set at 38° On the cam. John Mummert recommended the cam. I may have said that Ted did. Nevertheless, it was based on the transmission. I use an AOD. I use FORD's hi lift stock rockers but have always intended to get some higher lift roller rockers. Still all in all very happy with all of it. FWIW, the factory TBird tach does not have a peg at 5000 rpm. Not sure of any accuracy when mine runs past 5000, but it has been known to get back to zero! That's about 10 or 20 additional give or take. I think my engine likes 6 grand pretty well. Like I said before this is a street car that I can run down the strip occasionally if I want.