Weld it over to seal the holes, then re-deck the block. Only way to go. I wouldn't trust JB Weld as far as I can chuck the 3L with my bare hands.

Same with the rear head front oil supply hole. Only way to guarantee you'll never have any problems.

Overkill? Perhaps... Did it on mine, and on Pete's hybrid. Only way I'll do hybrid builds, since I have an "in" with a welder who is a true artist.

Dan G. and his Cougar Forged internal (Diamond & Pauter) full 3L, "Monster" Kinger F/I cut & P&P, T3/4 60 trim .82A/R ADC turbo, SPEC Stage 3, Torsen, Greddy Profec-B SPEC II, Apex'i Timer, Lots of Gauges! Used to have: 3.0L SVT hybrid