340 Intake manifold help

You'll need an adapter to use the TQ on the RPM. That usually reduces air flow a bit and it wouldn't hurt to check the hood clearance.

As screws pointed out, the OEM intake is originally from a 360, late '70's or somewhere in the '80's. That's when they used the smaller, offset thermostat housing because of a new design A/C compressor. Someone must have installed it on your 340 in the past. I don't really need another for the NHRA/IHRA Stock class car that I'm working on but was wondering if it's one of 3 legal castings allowed for my combo or a later version.