I don't have converters. Besides I pulled off headers and runs the same. The only code it has thrown is lean code on O2 sensor. Plugs say it's rich. Throttle control sensor is good. Doing another vacuum check. Then I guess it's off with the valve covers. Did I mention this motor is in an 83 Cherokee. Really tight fit. Don't pay attention if someone says " Can't put a 454 in there it won't fit". It did fit but bear to work on. Let you know how things progress and any more suggestions are appreciated.
Thanks