maybe we ought to ask why you want an in tank pump for a carbed setup? Plenty of external ones have been used for decades and way simpler to install.

That said, my 87 Diplomat had a factory in tank pump to supplement the mechanical one. It was a cylindrical pump that was essentially mounted where the pickup sock would have gone, then the pump inlet had it's own sock. It was locked up when I pulled it out and I had no idea there was a pump in there till then, so who knows how long it had been locked up, didn't seem to be needed to me.