Help: Chevy 305 and 350 build questions

I got lost for a while reading the flip/flap over that guys 74 monty getting 30mpg.
Anyway, I am in the process of dropping the oil pan (it has a crease and is
leaking oil). I will inspect the rod journals and after that decide what to do about the rest of the motor. I did feel pretty strong.
I will probably eliminate the cat. It is not needed in Texas (I believe) when the car is registered as an antique.
What is your (and others) opinion of this web site and the builders results from modifying a 305 without machining the short block: 94
If I can get 20mpg with a base Edelbrock 2101 manifold and a 600 Edelbrock carb, I would be VERY satisfied.

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