Absolutely right about the 250 head not being for sequential port injection.
Siamese intake port heads won’t work, you get one rich and one lean.
You don’t do TBI in search of more power, you do it for the same reason GM did it, to run cleaner.
TBI is just a better carb.
I’m a sports car guy My toy car is my MGB guys have been trying to figure out a good injection way to go,
Has the same port problem best any have done a few guys are using the holly tbi with mixed results.
How we get the most power is a supercharger, or an engine swap.
Dual SUs work nice once you learn how to tune them but the MG also has a fairly decent intake and exhaust system
Chevy really constipated these engines the head and manifolds is where you can find a little more power.
The 250 is already making about 30 to 40 more hp than the 216 and is lighter by about 100 pounds
Not sure how much of that the 4L60E will eat up
Add in the lighter rear end
If I was really after more power a 292 would be the cheapest, or a 350
The cheapest horsepower is less weight,
The old saying how fast do you want to spend
