Seeing a part for a sb chevy has no bearing whatsoever on parts made for a 318 Mopar. In fact you will find 100 or more parts for a sb Chevy for just 1 part for a sb Mopar. Mopar's have grown in popularity by leaps and bounds in the past few yrs. yet the aftermarket still sees no need to make much for them. If they can't make millions of dollars off of them it's not worth it to them it seems. Thank God at least a few places make stuff for Mopar's.