I have gotten rid of most of my sbc stuff, haven't messed with one in awhile. as far as your original question the quadrajunks were a spreadbore, but they were an unusual size pattern if I remember correctly. there are holleys made specifically to replace them with the same pattern. worst case you may pick up one of the cheap spread-square bore adapters discount sells for the time being if you have a decent square bore carb. if you need any help with info on an ls swap I can help you there. I have been messing with them more and more lately

oh and I'm Eric, Dylan's car was just at my house getting the subframe connectors