Valve length and installed height are two different things. You probably know that but your question was a bit confusing to me. Installed height pertains to length of spring when the retainer and keeper are installed. Too short of a valve reduces the installed height, however +.050 keepers are available.
A stock rebuild of those heads would probably specify an installed height for heads for a 67 400. Those numbers can be found in any Chiltons covering that period. If the heads were rebuilt to today's standards of performance, it is likely, that 1.600' was or should be the installed height using modern aftermarket dual springs. As for pushrods, you should be able to use stock type pushrods for a 400 for 1967. To eliminate the clatter, go with an adjustable valve train using BB studs and 7/16" poly lock nuts. Too many unknowns to not go this way.
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