I bought a used SBC intake manifold(guess where I got it,'ripoffbay',yep your right ) Well it retails for around $275 and I got it for $40 so I knew it would be in bad shape and possibly total trash. Three of the carb to manifold bolt holes look like some teeny booper learned for the first time"Righty tighty lefty loosey" and it appears it took him awhile to learn to finger tighten first before you use a wrench or ratchet,geeesh!
OK, I have a good drill press and am maniacally inclined ,who sells heli-coil inserts that are long/deep enough for carb to intake bolts or can you put 2 of them in the same hole? And it's an aluminum(Offfenhaaausssser) excuse the stuttering,I'as born that way!