Hi. I am no expert but I have always preferred the Fenton's as I just like the looks & durability of the cast iron & had used them many years ago on some big GMC stuff as well as a 49 chevy with a 216 engine.
Now after over 55 years away I am coming back to the inline chevy's for some fun driving.
BUT with that said, for my 235 I recntly purchased a Clifford dual carb intake with 2 of the 36-38 Webber 2 barrel carbs and as that intake has the very large water jacket all the way across the bottom of the intake manifold the Fenton's just will not fit without major modifications by grinding.
So when I ordered the intake set up I also ordered a set of the Clifford shorty steel tube headers as no modifications would be necessary to work with that big Clifford intake manifold.
In talking to Larry at Clifford he stated that when using the shorty's they would equal out to about the same as with their long steel tube header set as long as an X pipe was used between shorty headers & the mufflers. So I am going that way. As I am not an engineer I cannot explain exactly how that works but they have been doing this setup for many years. Perhaps use of an X pipe setup would also benefit the Fenton's.
I am having a problem with it being very slow getting my engine together to install due to my mechanic having been ill so I cannot comment on the actual results of going with this set up yet. It will likely be sometime next month now before I have a chance to get everything put together & the engine swap from the old 216 to the 56 model 235 completed.
This engine change with the 235, 2 two carbs, dual exhaust & a 264 cam grind should make it a good daily driver at today's highway speeds. But to do that I lilely will also add radial tires to get the old 46 chevy coupe to track better at today's speeds.
Jimmie