340 engine isn’t getting enough gas, why?

furrystump said
So its a thermoquad? Is this a stock setup? No 340 in 76 IIRC. It would be 360 I think, but I’m old and forgetful. Pictures always help.

The carb is a 4 barrel Edelbrock, part #1407. The original engine was a slant six, but it was swapped for a 340 before I got it.