The biggest limitation of the slant is that it's only 225 ci. No replacement for displacement.

IIRC the stock stroke is 4.125"? So it doesn't sound like you could stroke it a lot (even if such parts were available)...

I agree that a turbo would work well and the plumbing is simpler with intake and exhaust on the same side of the head.

"Speed costs money, son. How fast do you want to go?"

I would enjoy the Slant for what it is. Reliable simple but not powerful engine. Id clean it up nice and paint it- replace any and all seals and gaskets that can be easily replaced. You have an engine with 1 head gasket as opposed to 2, an engine whos intake manifold does not have coolant going thru it as well as its just an easy to work on and get at everything engine. Any new driver has none of those traits. The Slant 6 is like the early 70s Honda 4 stroke mini and motorcycle engines- the 70-125-250cc engines. By not making alot of power the internal stresses were low contributing to a long running non fussy engine.

Here is a Hot Rod Magazine article on a Slant Six build. This shows what was used and done to get an extra 77 horsepower. Just trying to show that it won't be cheap to get any decent horsepower front a slant six.

https://www.hotrod.com/articles/slant-sickness-add-77-hp-mopar-slant-six/

Lot of good advice given on this thread. From dropping in a v8 to just cleaning up and leaving the slant six the way it is.

Buy a used 440 with tranny and go enjoy it

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Should be plenty of those around since owners are now wanting to drop in gen III hemi's.

FWIW, I've driven or owned several Slants, and the 170/stick in a '60 Valiant was actually kinda peppy.
Seemed happier @ 70-75 MPH than the long-stroke 225s.
That Valiant weighed a lot less than the '70s Dart & Duster 225s I had, obviously a factor accelerating.
Being such a long stroke, on a 225 I would think enhancing low- & mid-range torque would be the best approach.
But even a stock 318 in the same chassis was better IMO, with no real MPG penalty.

Its reassuring though to have an engine thats quiet, easy to work on, reliable and gets great mileage. Get in that thing and drive worry free. Have the carb set up spot on for instant starts in any weather condition. Save the V8- whatever the size for another project.

If you can find a BBD that doesn't have the throttle shaft completely worn out, it is a good upgrade on a factory 2bbl intake.

I have a really nice BBD that looks like it's practically brand new. The problem is the intake I picked up is cracked, which I later found out is a common problem. So now I need to hunt for a cast iron intake.

Is the cracked intake aluminum?
If so have it welded by a decent shop

Is it the 2 piece welded together intake? Many of those have been fixed with JB Weld and a couple coats of epoxy paint.

I just run onto this on Marketplace;

https://www.facebook.com/marketplace/item/2667766703539179

Yes. It's cracked up pretty bad around the EGR right below the carburetor. Even if I could patch it up with JB weld I already made the mistake of separating the 2 manifolds so I broke off 2 of the 3 bolts that hold the 2 together.

bump the timing up, they like it and so will you

I set the base timing at 5° BTC.

Recurving the distributor works well. I have one with the advance slots welded about 1/2 way up. I run 15-18 initial and 32 total. There was a huge thread about curves for street cars on www.slantsix.org .

On another forum a member toyed with putting another block in line, ie a slant 12? Guess that would make the car a mid engine powered car?
I think he finally came to his senses.

Why buy a /6 B body if you are looking for performance?

I actually bought the car for parts, but it's too solid and too "odd" to part it out. I'm not looking to make it into a drag car I just want to get the most I can out of it without doing anything drastic.

So I've been able to pool up almost all the parts for the 2 barrel swap. The only problem now is the manifolds. Do I find someone to repair what I have? Or do I look for something different? My concern is that the 2 piece aluminum intake will crack again, even if I do have it welded. Maybe I should find a cast iron intake?