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That sux Nick. Are the Type I and II valve spring heights the same? Do the rocker arms have the same P/N? Did you use new head bolts?
Since it ran OK to start I would thinkit wasn't an assembly error. Sounds more like a part compatability issue. The only way to know for sure is to take her apart again (very slowly and carefully, looking at every single piece as it comes off).
Good luck.
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Started rebuilding IC engines in 1968 at the US Merchant Marine Academy. Don't think you know more than me about auto/IC/control systems unless you can document your education.
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