The thickness of the pump body is how you tell if it's a high volume pump or not. Your pump appears to be about 1/4" shorter than the HV pump pictured above, so yours would be a standard volume pump.
Like I said, not a bad thing and it's likely all it needs.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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