Also, it might be a good idea to check for badly worn cam lobes on the cylinders with a wide gap between the pushrods and the rocker arm adjusters. A couple of nearly flat cam lobes could account for the lack of power. All the lifters should rise about the same amount as the engine is turned over. Milk can and flat top lifters shouldn't be used on the same engine- - - -somebody might have cobbled together a bunch of mismatched parts.
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!