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I had that discussion with an engine builder this week and he recommended finding a 69-75 351 Windsor block because they are stronger and machine the lifter bores to fit. He also recommended the 408 stroker be internally balanced and be sure and use the ARP 2000 series bolts because some of the previous ones have failed. As far as heads he recommended the ARP 210 heads that Keith Craft has or as a second option a set of Victor Jr. Heads. 1.7 roller rockers and a single plane intake.
Now all that being said remember this is one engine builders opinion and he is going on his experience building engines for mostly race applications. One of our members her DL uses this guy and has had no failures at RPM's around 7500. I would look to Keith Craft if I were you because he has probably seen it all. I am sure he has even had some experience with the PRO heads from Austrailia you described. I have even looked at them on EBAY.
Clois
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