If it has good compression, good oil pressure, and no visible smoke: if it ain't broke don't fix it.
There is an unfortunate tendency to "take it apart to replace the dried out gaskets". That's a week's worth of work to save $1. worth of oil.

More important:
Have you driven the car?
Do you like it?
Does it need other repairs (front end, brakes, driveshaft, rear end, shocks, gas tank, wiring, steering box)?
It's not going to be much faster than it is now without a lot of work. The stuff you have won't add more than 30 hp.
Completely rebuilding it from the crank up can easily run $2,000 and adds this much power: zero.