I ran a single snorkel air cleaner with heat tube since someone replaced my OE 68 340 left exhaust manifold with a 73-up heat stove type… it probably helped some. But wasn’t anything amazing in negative 10 degree Iowa weather
Yeah -10 in the midwest might need more help lol... I had a dual-snorkel air cleaner off a 1972 440 I ran on a 360 with air-gap and it helped a lot but the few times I drove it when it was around 10-15 above zero it was struggling a bit. I bypassed the temp control valve and had it running with the doors open or closed by manually hooking up a vacuum line. Also was running shorty headers so I cut up a factory heat stove and steel-zip-tied it to the #1 primary tube.
