Also is your distributor fully functional? Mechanical advance working, vacuum advance working? Using this
How to limit mechanical advance in a mopar distributor, tuning for street, strip or all out racing, cure that rich stinky idle, win races
but with the springs
Mopar Distributor Mechanical Advance Timing Limiter w/spring kit 610877674114 | eBay
I use the lightest springs to get more advance faster. Set the plate to the "10" position. With it set at "10" with an initial advance of about 18 degrees it will give you about 30 degrees with the mechanical full in (if you have a timing light that has a timing adjustment then I would set the full in at high RPM to 30 degrees and let initial be whatever it ends up. While there make sure the vacuum advance is working (plug it into a vacuum port and make sure the timing moves). Again with a fancier timing light it is nice to measure the amount of advance you get with the vacuum canister unplugged and then plugged into full manifold vacuum to make sure it is working. It should give you 18-24 degrees'ish.
This can make a big difference in how much power the 225 has at cruising speeds.