318 Torque Build

4.10s and 33s are the equivalent of 3.23s with 26" tires. So I imagine, if it still has the stock lo-stall TC in it, that she's a bit of a slug on take-off.
Normally aspirated there are only three ways to get off the start-line quicker;
1) is a higher stall, and
2) is more cylinder pressure.
3) is more cubic inches.

> if the 318 has to stay, then more stall is usually the best choice. Going from say 2000 to 3000, your 318 could be 100 ftlbs stronger, which could translate to more than 100 horsepower.
> if you stroke it to 349; this is a change of ~10%.. With no other changes and a stock stall (guessing 2000 or less), 10% is not a very significant change. I mean at WOT and 2000 rpm, you might be looking at 10horsepower difference.
> if the 4.10s have to stay, more cubes at same stall will help. But cubes, compression AND stall would of course, be the cat's meow. This gear/tire combo will force your engine, into a low-rpm situation until about 3300rpm/30mph; so no matter what you do to the engine in terms of bolt-ons, nothing will make a significant improvement. Only the Higher-stall will get you moving quicker.
>A bigger cam usually has a later-closing intake valve, and so, with no other changes, will lose cylinder pressure, making the zero MPH take-off yet softer.
> if you install a 4bbl the power does not begin increasing until the capacity of the current carb is exceeded, which could be around 3000 rpm. With no tirespin and your current 4.10s/33s, this could be 27mph. If you make the secondaries open at zero mph, chances are very good with a 2000TC that she will just bog.
IMO
Of all these options; the higher-stall TC should be the very first Go-To. After that should be gears; but to be significant, it would need to be at the very least 10%, so 4.56s. But this only brings your speed down at 3300 from 30 to 27mph, so not the best idea. You can get the same 10% with the 3.58 crank. And then you also get the opportunity to increase the cylinder pressure. That's a 3-fer; More displacement/more low-rpm torque, plus more pressure, plus a slightly higher stall on the stock TC.
But since the engine is out, now's the perfect time to up the stall. And since the engine is completely torn down, now is the perfect time to up-cam, and optimize the pressure to it.

Now;
since you already have the 4bbl, do yourself a favor; With whatever is currently on it, do some time-trials to 27 or so mph, and average them out.
Then after you get the 4bbl on and working, do the time-trials again to 27mph; no cheating, cuz you'd only be cheating yourself. Now calculate the difference and convert it to a percent decrease in time, if any......... You don't have to publish it, this is just for your own satisfaction.

In any case; Happy HotRodding.