225 Slant Six Manifold

chinze57 said
I've got a 225 chrysler slant six in my '64 Dart. I'm having a bit of an issue with the car stalling out in drive, which it seems is due to a slight vacuum leak (when i first got the car it stalled if not constantly revved, after a clean up and new gaskets and such, it started only stalling in drive when idling, there are some cracks my mechanic plugged on the intake manifold).

What should I do about this? I'm thinking that I should replace the intake manifold, but I don't have the faintest clue what the best will be. It looks like aussie speed makes a manifold for /6 with either 4 barrel carbs or 2 barrel carbs (I believe mine is 2 barrel).

Any thoughts or ideas? Y'all have years more experience with this than I do so I appreciate anything.

Concerning your current intake manifold, there is a two piece die cast aluminum intake in two bbl and one bbl versions that have leak issues at the seams. But they can be successfully repaired be either welding the seams or sealing the seams with epoxy.
So unless you want to go with a different intake manifold, you do not need to.
It would be helpful if you could post a photo of your current intake manifold. So we can better understand the issue.
If you do change the intake manifold, that change should be made in conjunction with other engine component upgrades. With a 4 bbl you should also consider raising the compression, maybe a better cam and improved exhaust to get your money’s worth out of the larger carb.