Don't know. The engine vibrated from the day it was installed. Prior to me working on it the flywheel and harmonic balancer were swapped out in an effort to fix it. This is the second 383 built by the same "mass producer" of strokers that I've done this on. Both are perfectly smooth operating now.
After digesting this concept their are some things to consider if you need to add more than 10 grams to an engine it's now "externally balanced" meaning at high RPM the crank will flex causing the center bearing to wear from taking the brunt of the load, with a chev it will eventually eat the 3rd main bearing, on a ford it will take out the 3rd main center/thrust bearing causing all kinds of issues with excessive end play converter, rods etc. If the engine doesn't see 5000+ rpm most of the time it will live awhile before the defecation hits the reciprocating ocelator or "POOF" Another one bites the dust. On a further note what race organisation allows Chevy engines in a ford?
We ran a V6 chev motor in class1 car with a S10 body on it in SNORE late 90s, never could keep the body on more than 30 miles if memory serves the front end is still hanging on the wall at a fine establishment called "the green lantern" Ely nevada.