Need some advice

crackedback said
Not a single question about the timing until post #12?

Initial and total setting, with no vac advance attached?

Tire is only ~26" tall.

Again,

You're assuming the OP has no clue on Timing.

He stated that the car is running both 'good and smooth'. And that at
75 MPH the engine is cranking fine.

He just expected 'more' from the Engine.