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.