Accel HEI PowerBand Distributor?
 

Just completed a TBI to Carb conversion on a Gen 6 454. this is the dist. they gave me to change to. what is the difference between this model and a regular HEI? i'm getting some spark knock/ pinging at light throttle and small load and wondering if this is the problem. can't seem to get it to stop. thanks for any help, Mike