The Marti Report won't tell you much more than you already know...the cylinder heads as pictured are CJ heads (4 exhaust manifold bolt holes per cylinder).
I had the 4 speed version of the Mach I back in the day and have a '69 428 SCJ 4 speed Ranchero GT is in my garage now.
Call or text me any time Rick if you want any 428 CJ info...
Cheers
Cal
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