What the hell is this thing?
 

So I'm under my car today and I notice something I never saw before. On the driver's side of the engine block right next to the crank pulley (but facing towards the fender instead of forward) I see this hole. It looks kinda like the exhaust port on a cylinder head...a rounded rectangle with a bolt hole on either side. Is this where a mechanical fuel pump would go? That was my only thought. I can't imagine what else would go there. And my car was originally a CFI car so there wouldn't have been a mechanical pump. I just figured if that were the case there would've been some kind of block off plate. Any ideas?

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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

Is it on the block itself or the timing chain cover? If it's on the timing chain cover it must be for a mechanical pump.

Yeah, its for a mechanical fuel pump.

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87 GT, 4 inch cowl hood,17x9 Cobra R's/255/45's,GT-40 heads,Crane 2031, Edelbrock intake, long tubes headers,h-pipe,Flows,BBK cold air, Mass air,70mm MAF, 1.7's, 1" spacer,underdrive pulleys,Pro 5.0, King Cobra, Adj. fuel Reg., Lakewood Lift Bars,50/50's,subframes, 4.10's.
Best time 12.759
Best MPH 106.79
Best 60' 1.695

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It's not on the cover. It's below that on the block and even with the crank pulley.

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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s