what do you suggest I use to plug them? JB Weld? Try to weld them up???

Also does it matter what size the fitting is that goes from the fuel pump to the vacuum/boost nipple on the turbo? I was just planning on using an 1/8" brass pressure fitting like the size of the oil pressure sending unit's threads are.

69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.