340 upgrade

Depends on what ur doing with he car
Bump compression up a little
Port heads, good valve job
Port intake
Get cam spec to you flow numbers and what matches ur gears,tq converoter in the car currently have a good company go thru ur carb I use CSU Kevin in so cal

That's a stock rebuild type of one

If u have the money
Csu built double pumper
Ported eddy heads
Ported victor 340
Solid roller
13:1 e85
Built 904/lupo custom veroter