Ron,
I'm using the short pump. Because the engine is built on a race block it has an external oil pump and uses serpentine (flat) belts. Guess where that left me ... absolutely nothing could be bought. So I made the entire front end setup. Bought 7075 plate and bar on e-bay and milled and turned all of the parts including two idlers. We'll see how this works when it's fired someday ;>)
http://www.mstarling.com/Album/front_equip_S4_2vs.jpg
__________________
Mike Starling
Sabre 6210
351W 4bolt SVO block
Luntati crank, Oliver rods
T&D tubes and rockers, internal balance
506
fwhp@6500 rpm, 481
ft-lb@4200 rpm
G50/52 ;>)