Hey,it's a factory cast iron manifold with a Holley 4bbl,I got the 049 oval port heads otherwise I wud be interested.thanks tho.i will take a look at the performer.i wanted to go with a performer rpm air gap but I don't think I have the clearance.Would a single plane like the torker/torker2 be a good choice on a stock 454? Not sure cuz of higher rpm but it is really low profile.