Guys I'm putting a 1965 413 into a 74 W300 pickup. This block has the hole in the block for the dipstick, not the pan like the trucks. I've installed a truck oil pan and would've used the 'car' dipstick, but it won't fit with the rear sump truck pan. I've got a truck dipstick, no problem, but my question is what to do with the hole in the block? I imagine with crank pressure a plug could blow out under high rpm? The opening in the block is relatively close to 1/8"NPT size. Would it be sacrilegious to drill and tap the hole or could it weaken the block? Suggestions?