Update to the PS issue: You can NOT bolt the Magnum PS setup to a non-Magnum engine block... the LA block is missing at least one bolt hole at about the 2:00 position relative to the frost plug on the DS front of the block. See the attachment for "block face" (above) to see where I'm talking about. That's the bolt hole that the extended boss on the PS bracket bolts to, and at least two of the other three bolt to the cylinder head (my best guess, couldn't get to the engine in the salvage yard this weekend).

HOWEVER, all is not lost. It looks like some relatively simple mods to the stock Saginaw mounts will allow the PS pump to bolt up to the Magnum serp. setup. Here's my revised mockup of the LA PS pump with Magnum pulley attached:



The water pump is out of the way on this one because of where the mounting bolt (the pivot bolt on the Saginaw brackets) needs to go on the Magnum water pump. Obviously, the Saginaw bracket would interfere with the WP.

Continued...