Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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Without pulling the '68 model 14 heads & disassembling them, & having a pair of seasoned eyes carefully examine the ports, if they have been ported, will be very hard to tell to extent what head work has been performed. Such a small valve mid 90's cc '68 cyl headed 400 shouldnt run that well up top, instead it would rely on moderate torque to get the job done by 4500 RPM.
For a few decades, it was fairly common to upgrade the late '60's usage 46 & 47 casting heads, as well as '70 model 15 casting heads through proper port & seat work, 2.11-1.77 valves, & conversions to screw in studs. Ive yet to run across a pair of '68 model 14's that received that treatment, but am sure there are some out there. A lot of such upgraded cast iron Dport head work has slowed down over the last 10 years with higher machine shop prices, what was a poor economy, & with so many head choices out there.