Who makes a 340/360 thermoquad style aluminum intake

if you did decide to stick with the oem intake, you can port match the intake /heads/ gaskets. It's not huge, but it helps.
I'm partial to TQ's, so I find it encouraging to see someone else is still using them. I think Edelbrock has started producing their own version of the TQ, but they did away with some of the best features IMHO.

I have always been partial to TQ's. The heads on my motor have had some work done to them. I would call it more of a "clean up" than porting. I have a Demon which looks kind of similar to a TQ. It's a good carb, just not the right one for this motor. On a side note as stated I am partial to the TQ's... so much so that I had a Chevelle years ago and when I popped the hood the GM crowd would be mortified to see a TQ where a quadrajet should be. That quadrajet was one of the worst carbs I ever had to deal with.