What would you do? Slant performance

Semantics and details. Mr newbe knows nothing about such.

And my experience with slantys is that camming it up makes the bottom soft; But honestly, IMO, Spending all that coin was not worth it, And I will never do it again.For a quarter as much money I coulda had twice the torque and power, and kept my hiway gears.

I'm not privvy to what "Mr. newbie" does or doesn't know, but he did ask for
suggestions on how to improve his /6 output, that is what I'm offering. As I was pointing
out, the 3 methods you listed are not the ONLY way to improve output.When I built mine
28yrs. ago, I did it to challenge and teach myself, and it was worth every penny. At no
point did I delude myself that it would keep up w/my smallblock dart, but I beat plenty of
V-8's w/that car, and it was a source of pride to do so.
The OP said he didn't want to V-8 swap, I think he may believe that is more
costly than it is, certainly a scrapyard bound donor car would get it done for half the
total $ invested. I would never take back the SB swap I did to my 1st dart either,that
car also got a four gear and 8.75,and it donated the slanty I built for the other.