The best factory LA 4bbl intake for the spread-bore T.Q. carbs was the '71 and '72 340 intakes while the best factory square bore LA intakes was the '68-'70 340 intakes.

ThermoQuad carbs have the following strong points:
1)weigh 40% less than a typical Holley 4bbl modular design,
2)keep the fuel about 25+ degrees cooler in summer heat which translates to more power(phenoilc bowl)
3)are the newest American 4 bbl designed carb and has the most sophisticated metering system of all .(The basic Holley 'modular' design goes back to about 1955 and the Carter AVS about 1965, the Q-Jet about 1964, the Carter AFB about 1957 while the solid fuel metered T.Q. was designed in approx 1971.
3)Thermoquad carbs can be tuned externally on all three main circuits and therefore do not require re-jetting on the '72-'74 oem carbs.
4)offer excellent gas mileage,
5)offer excellent performance too.
6)have gained in popularity a great deal; many models are now bringing up to $300+ just for a build-able core.

It is true that bowls can warp but it is not as common as you might think. And repair can be done successfully to remedy warp age.

I strictly use T.Q. carbs on all of my own cars and have quite a few satisfied customers using T.Q. carbs, David.

You say you don't call names but you were the first one to call the TQ a name, I give you credit though cuz you deleted it.

TQ main bodies are still available new BTW.

A TQ would be the best choice, just get one from someone who knows what they are doing. I just got a 72 340 carb given to me by a guy who hates TQs swore it would never run again, it was fresh from tomco. I pulled the top off and found no orings in the bottem of the jet wells and the tab that engages the secondaries was bent to open the secondaries all the way. I bent the tab back threw in some o-rings and it runs great, no choke hooked up and it starts right up and idles cold even at 30 degrees F and I can hit the gas and go. Most every TQ someone has told me was junk was a user error. The only broken bowl I have seen that wasn't from throwing around was where he was trying to pry the top off with two screws still holding inside the choke tower. I guess that warped bowl was the TQs fault. BTW there is a comment in one of the mopar mags a while back about this happening and I was rollin laughin because I knew someone who had done it.

Now back to the subject. The port mismatch is not as bad on the 360 manifolds as the 340 manifolds but there are no factory square bore 360 manifolds. The 360 4bbl manifold actually matches the 318 heads better than the 360 heads. Also yes the 318 4bbls used the same manifold as the 360 but they also had a 360 head. That all being said I would just get a 340 manifold and plop it on if you run a square bore and not worry about the mismatch unless I already had the heads off. I have ran them like that and they seem to be fine as long as the carb ain't too big. If you were willing to run a TQ then the 360 manifold is perfect.

I have run plenty 318s with 360 intakes

yes its a little mis matched,cant really notice it from the seat dyno though

and I 2nd the Q-jet,that will get the throttle responce back some and feed it plenty o gas

the main thing with slapping a 4-v on a teen is the little cam dont like it but you will notice a gain in performance,same with swapping 360 heads on a stock teen...the cam cant feed the flow

swap the cam to some thing alittle bigger allways helps

I would suggest an LD4B intake and the square bore carb you have,its on par with a LD340 intake but for the 318 ports

and get over the thermo bog...quadra bog...holley gas hole thing....run what ya brung

send all q-Jets to me please

I used to have a sticker on the window of a 68 road runner from holley

it was black and red said holley gas holes,showed a monstrus holley carb

no air horn just 4 great big holes with the discharge nozzels

not for gas milage for sure

OH! I ment to say quada junk not quadra bog...my bad!