Has anyone experienced overheating problems with Dave's adapter? If not, getting down in the weeds about pump volume specifications sounds a lot like nitpicking. The proper fan position on the older trucks is probably at least as important as the volume of coolant that's being moved.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!