Hi, R. W.,
Actually, by contemporary racing engine standards, the 3.5" stroke Packard V8 is a SHORT stroke engine. The Packard V8 max RPM is not limited by the length of the stroke or the strength of the cast steel crank, rather by the weight of the valve train. The intake valves are 2" diameter, 3/8" stem, 5.7" long and heavier than the hubs of hell. The large diameter valve springs and steel retainers are heavy themselves. The pushrods are also 10.5" long and commensurately heavy. It takes lots of valve spring pressure to control all that weight at higher RPMs.
My contribution was to provide one of my Iskenderian 505C cams for Rich to have Deema Elgin regrind for his. When he decides on the best profile, I am hoping Deema will regrind my other cam to the same spec. Exciting times for the Packard V8.
CalCams in Oakland CA used to have one or 2 profiles available for the Packard V8...Isky "street" and "3/4 race" as I recall, but it has been a few years...might be worth giving them a call. IIRC, they charged me $125 for the Isky re-grind about 10 years ago.