maybe i can help you out a little i ran a 532ci and found a girdle held the bottom to rigid it need to flex some when making big hp 500+ 2bolt mains will move around to much. i use the best.spend your money one time go to blue thunder for your heads and 4bolt main caps. (they make only ford parts) use a truck block a series which has a higher nickle content a wee bit haveier than a car and a lot stronger will go 598 ci max. the bt heads need very little work to get max output and will out flow any thing out there and use the same valve train componts as the scj. i use elderbloc victor 460 for high end torque. your only problem with the 460 is oiling @ high rpms 6+ it will pump your pan dry you need to restrict the flow. i use a lifter bore restrictor system to keep the oil @ the crank. i am 80 over 14:1 700 lift 5700 stall c-6 2800lb car. shifting @ 6500 =7000rpms turning a 5.90 in the 8th w/a 1.2 60ft never ran full potenial race always over 2/3rd track. get your configeration on paper i called lanuati for a cam came to be a special grind. then called ross for pistons made sure the pistons had enough meat @ the bottom to stand the fly cut used egale rods scat crank turbo action convertor and valve body had to shift 2nd on the fly first build cost about $10,000 now building a 557ci reduced compression to shoot a 150 big shot.cost about $2000.00. that need for speed can be dangerous i am 71 now lots of luck. use an old school machine shop and don't rush them